1 2/5 : 2 = x : 3.6

Представляем: \( \frac{7/5}{2} = \frac{x}{3.6} \). Упрощаем: \( \frac{7/5}{2} = \frac{7}{5 \cdot 2} = \frac{7}{10} \). \( \frac{7}{10} = \frac{x}{3.6} \). \( x = \frac{7}{10} \cdot 3.6 = 2.52 \).