2 y:3\frac{1}{5}=4:2\frac{1}{4}

Решим пропорцию:

$$y:3\frac{1}{5}=4:2\frac{1}{4}$$

$$y: \frac{16}{5}=4:\frac{9}{4}$$

$$y = \frac{16}{5} \cdot 4 : \frac{9}{4}$$

$$y = \frac{16}{5} \cdot 4 \cdot \frac{4}{9}$$

$$y = \frac{16 \cdot 4 \cdot 4}{5 \cdot 9}$$

$$y = \frac{256}{45}$$

$$y = 5\frac{31}{45}$$

Ответ: $$y = 5\frac{31}{45}$$