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This lightweight ratio calculator allows you to calculate the missing value of a paired ratios in answer to the math question on ratios: "calculate value D where A is to B as C is to D". Enter three numbers in any of the ratio inputs and the fourth value of the paired ratios will be calculated. This ratio calculator can also be used to apply the same ratio to different values.

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A simple way to remember this ratio formula is A is to B as C is to D |

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If you were looking for an alternate ratio calculator you may want to try one of the following ratio calculators, each includes a detailed ratio tutorial and full ratio calculations