Solve any proportion a/b = c/d for the unknown with cross-multiplication step-by-step. AskSia handles direct, inverse, and joint variation, plus word problems with proportional reasoning, and includes a substitution check on every solve.
The AskSia proportion solver is an AI tool that solves any proportion a/b = c/d for an unknown variable. AskSia cross-multiplies (ad = bc), solves the resulting equation, and checks by substituting the answer back into the original proportion. AskSia also handles direct proportion (y = kx), inverse proportion (y = k/x), and joint variation (y = kxz), finding the constant of variation and using it to solve for any missing value. Word problems with proportional reasoning are translated automatically.
Most proportion mistakes come from setting up the wrong cross-multiplication. AskSia gets the setup right first, then shows the algebra step-by-step.
For a/b = c/d, AskSia multiplies both sides by bd to get ad = bc. The cross-multiplication step is labeled explicitly so you can see why it works (multiplying by bd cancels both denominators), not just that it works.
Given y is directly proportional to x and one (x, y) pair, AskSia finds the constant of variation k, then uses y = kx to find any missing value. Useful for scaling problems and Hooke's law-type setups.
Given y is inversely proportional to x, AskSia finds k from a known pair and uses y = k/x to find missing values. Useful for Boyle's law-type problems where two quantities multiply to a constant.
For y = kxz (joint) or y = kx/z (combined), AskSia finds k from one full data row and uses it on others. The constant of variation is named, and the substitution is shown.
Word problems with 'directly proportional,' 'inversely proportional,' or implicit proportions (recipes, scale models, map distances) are translated into the right proportion or variation equation automatically.
After solving, AskSia substitutes the answer back into the original proportion and verifies both sides match. The check catches arithmetic errors before you submit.
Snap a photo, paste, or type the proportion or word problem. AskSia reads a/b = c/d notation, fraction bars, and phrasings like 'y varies directly with x.'
AskSia cross-multiplies (ad = bc) and solves the resulting equation for the unknown. Each step is named so you can apply the method on the next problem.
AskSia substitutes the answer back into the original proportion and confirms both sides are equal. Generate practice problems or ask follow-up questions.
Every solve syncs across Web, iOS, and Android — start it at your desk, finish on your phone.
Split-panel interface with the worked solution on the left, the auto-generated diagram and AI tutor chat on the right.
Open the camera, frame the problem, and the worked solution plus diagram appear in seconds.
First-time proportion problems with small integer values. AskSia explains cross-multiplication in language that matches middle school textbooks, with the check shown explicitly.
Direct and inverse variation problems with the constant k found from a given (x, y) pair. AskSia then uses the equation to find any missing value.
Recipe scaling, map distances, currency conversion, similar triangles, and unit conversions. AskSia identifies the proportion in the prose and sets up the cross-multiplication.
Problems where y depends on two or more variables (y = kxz, y = kx²/z). AskSia handles the multi-variable case and finds k from a full data point.
Proportion problems are SAT, ACT, and GRE staples. After any solve, generate practice problems at the right difficulty level for your target exam.
Similar triangles, scale models, and map problems all reduce to proportions. AskSia handles the geometric setup and the algebra together.
General chatbots hallucinate. Photo solvers stop at math. AskSia is built for actual coursework with verified accuracy, visual learning, and every subject.
| Feature | AskSia Solver | ChatGPT | Photo Solvers |
|---|---|---|---|
| Solution accuracy | ✓ 98% | ~70-85%, hallucinations | ~90%, math only |
| Auto-generated diagrams | ✓ Every solve | Inconsistent / broken | Graphs only, math-only |
| Step-by-step explanations | ✓ Numbered + plain English | Inconsistent depth | ✓ Math steps |
| Subject coverage | ✓ Math, Physics, Chem, Bio, CS, Econ | ✓ Wide but unverified | Math only |
| Photo input | ✓ Handwriting + diagrams + code | Photos OK, weak on handwriting | ✓ Math photos only |
| Answer verification | ✓ Self-checked before display | No verification | Math engine only |
| Tutor follow-ups | ✓ Hints, alt methods, ELI5 | ✓ General chat | Not available |
| Practice and flashcards | ✓ One-tap from any solve | Manual prompting | Not available |
| Code debugging | ✓ Python, Java, C++, SQL... | ✓ Yes | Not available |
| Free to start | ✓ Daily solves, no card | Limited model access | Steps locked behind paywall |
Join 2M+ students using AskSia to solve proportions and variation problems with cross-multiplication, the constant of variation found cleanly, and a substitution check on every solve.
