Solve a proportion by keeping two ratios equal.
| Input | What it means |
|---|---|
| Known ratio values | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Missing position | Use the measured or stated value for this item, with the unit or category shown beside the field. |
If 3/4 = x/20, then x = 3 × 20/4 = 15.
Scale measurements, recipes or quantities that share a constant ratio.
Keep the original input precision through the calculation and round the final answer to the precision you need. Rounding an intermediate result can change later steps.
Check the operation, units, signs and rounding first. Equivalent fractions or expressions can look different while representing the same value.
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