Proportion Calculator
Solve the proportion a ÷ b = c ÷ x.
Calculations run in this browser. Values are not submitted to the server.
Result
Formula and assumptions
Cross multiplication gives x = b × c ÷ a. The divisor must not be zero.
Example values are shown in the input placeholders. Results use browser number precision unless the tool uses exact integer arithmetic. Check units and assumptions before using a result.