About rule of three
Direct rule of three solves proportions where A is to B as C is to X.
How to use
Fill A, B, and C. The tool calculates X using X = B × C ÷ A.
Rule of Three
Solve direct proportions with a simple rule-of-three calculator.
Solve direct proportions with a simple rule-of-three calculator.
Direct rule of three solves proportions where A is to B as C is to X.
Fill A, B, and C. The tool calculates X using X = B × C ÷ A.
Result X
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