Rule of Three
Calculate direct and inverse proportions step by step
Solve any direct or inverse rule-of-three problem. Enter three known values and get the fourth with the full solution.
Example: if 3 kg cost $15, how much do 7 kg cost?
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How it works
- 1Select whether the relationship is direct or inverse.
- 2Enter the three known values (A, B, C).
- 3Press Calculate to find X.
- 4Review the setup and each operation step by step.
Frequently asked questions
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