Solve a proportion

Fill in any three values and the missing one is solved for you. Fill in all four to check whether the proportion holds.

: = :

Cross products

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Simplify a ratio

Reduce a ratio to its smallest whole-number form by dividing both parts by their greatest common divisor.

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Simplified

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Greatest common divisor

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Part-to-whole percentages

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Multiply (or divide, with a fraction) both parts of a ratio by a factor.

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Scaled ratio

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Same ratio, simplified

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The first ten equivalent ratios (×1 through ×10) for a ratio, based on its simplified form.

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Simplified

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Part-to-whole percentages

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Multiplier	First part	Second part
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