Ratio Calculator

Simplify ratios or solve for a missing value in a proportion A:B = C:D.

\frac{A}{B} = \frac{C}{D} \implies A \cdot D = B \cdot C \text{ (Cross-multiplication)}

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Step-by-Step Calculation & Explanation

A ratio compares the size of two or more values relative to each other. A proportion states that two ratios are equal. In proportions, we use cross-multiplication to solve for a single unknown variable (marked as 'x' or left blank).