131:4= 327

$$13\frac{1}{3} : {\frac{4}{27}} = {\frac{40}{3}} : {\frac{4}{27}} = {\frac{40}{3}} \cdot {\frac{27}{4}} = {\frac{10 \cdot 4 \cdot 9 \cdot 3}{3 \cdot 4}} = 90$$

Ответ: 90