Cross Multiply Calculator
Solve proportions using cross multiplication. Enter two fractions to find the missing value.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator solves for a missing value in a proportion using cross multiplication. It also verifies if two fractions are equal.
- Enter the known values into the four fields: Numerator A, Denominator B, Numerator C, and Denominator D.
- Leave one field empty to solve for that unknown value. If all fields are filled, the calculator will check if the proportion is correct.
- Click Calculate or press Enter.
- The result shows the missing value or a verification message, along with the step-by-step formula used.
Example: To solve 2/5 = 4/?, enter 2 in Numerator A, 5 in Denominator B, 4 in Numerator C, leave Denominator D empty, and click Calculate. The result is 10.
Note: Denominators cannot be zero. Use any real numbers (decimals allowed).
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Frequently Asked Questions
Cross multiplication is a method to solve an equation involving two fractions set equal to each other. Multiply the numerator of the first fraction by the denominator of the second, and set it equal to the numerator of the second times the denominator of the first.
Enter the values for the two fractions, leaving the unknown field empty. Click 'Calculate' to find the missing value. If all fields are filled, it checks if the proportion is correct.
Yes, you can enter decimal numbers. The calculator handles all real numbers except zero denominators.
