Proportion Solver

Solve proportion equations of the form A / B = C / D by finding the value of unknown variable X.

💡 Select which value is the unknown variable **X**

A is X B is X C is X D is X

x = 4

Proportion Equation Solution

🔒 Calculated locally in your browser — proportion solvers are client-side

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How proportion equations are solved

A proportion states that two fractions are equal: \(\frac{A}{B} = \frac{C}{D}\). To find the value of one unknown variable \(X\), we cross-multiply and solve:

**Solve for A:** \(A = \frac{B \times C}{D}\)
**Solve for B:** \(B = \frac{A \times D}{C}\)
**Solve for C:** \(C = \frac{A \times D}{B}\)
**Solve for D:** \(D = \frac{B \times C}{A}\)

Proportion Solver

How proportion equations are solved

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