Solve for the missing value in a proportional relationship (a/b = c/d).
Enter 3 of 4 Values
Format: a/b = c/d. Leave one blank to solve.
Solved Proportion
Missing Value6.0000
Simplified Ratio0.5000a/b ratio
About this calculator
What is a Proportion?
A proportion is an equation that states that two ratios are equal. Solving a proportion means finding one of the four values when the other three are known.
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Pro Tips
Use 'cross-multiplication' to solve for the missing variable.
Proportions are useful for scaling recipes, map reading, and unit conversions.
Ensure that the units are consistent across both sides of the equation.
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Fun Facts
"The 'Golden Ratio' is a special proportion (approximately 1.618) often found in nature and art."
