Proportion Calculator
Solve the missing fourth term when a/b = c/x.
Your numbers
Missing value x
Use consistent units. The result follows the assumptions you enter.
Scenario comparison
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Formula
x = b × c ÷ a
Solve the missing fourth term when a/b = c/x.
Worked example
- a
- 3
- b
- 4
- c
- 6
- Missing value x
- 8
Scope and limitations
Use consistent units. The result follows the assumptions you enter.
Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.
Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.
Formula version: de8c10996397 · Example checked: