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Math Calculators
Ratio Calculator
Solve a proportion of the form a:b = c:d for the missing value d.
d (a:b = c:d)
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About the Ratio Calculator
A proportion states that two ratios are equal. Given three of the four values in a:b = c:d, you can solve for the missing one by cross-multiplying.
Formula: d = (b × c) ÷ a
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