Calculadora de Proporción — Fórmula
## How to Solve a Proportion
### Formula
**If A/B = C/D, then D = (B * C) / A**
A proportion is an equation stating that two ratios are equal. Cross-multiplication gives A*D = B*C. Solve for any missing value by rearranging. This is fundamental to scaling, unit conversion, and similar triangles.
### Formula
**If A/B = C/D, then D = (B * C) / A**
A proportion is an equation stating that two ratios are equal. Cross-multiplication gives A*D = B*C. Solve for any missing value by rearranging. This is fundamental to scaling, unit conversion, and similar triangles.
Ejemplo Resuelto
If 3/4 = 12/x, find x.
- Cross-multiply: 3 * x = 4 * 12
- 3x = 48
- x = 48 / 3 = 16
- Check: 3/4 = 0.75, 12/16 = 0.75. Confirmed.