Proportion Calculator
Math CalculatorsSolve for X in the proportion A/B = C/D.
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Value of X
About This Tool
Solve proportional relationships instantly. Enter three known values to find the fourth missing value (X) in the equation A/B = C/D.
Frequently Asked Questions
A proportion is a mathematical statement that two ratios are equal. It is often written as two fractions set equal to each other.
The most common method is cross-multiplication. You multiply the diagonal values and then divide by the remaining number to find X.
This tool saves time and prevents calculation errors when scaling values up or down while maintaining the same ratio relationship.
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