How do I solve a proportion?

For a/b = c/x, cross-multiply to get a·x = b·c, then x = b·c/a. For 2/3 = 8/x, x = 3·8/2 = 12.

What can this be used for?

Scaling recipes, converting units, map distances, similar triangles — anywhere two ratios are equal and one term is unknown.

Kalkulator proporsi gratis. Selesaikan a/b = c/d ketika salah satu variabel tidak diketahui — aturan tiga lurus atau berbalik.

Selesaikan proporsi yang tidak diketahui dengan aturan tiga.

\frac{a}{b} = \frac{c}{x} \Rightarrow x = \frac{b \cdot c}{a}