Решим уравнение:
$$y : 3\frac{1}{5} = 4\frac{1}{2} : 2\frac{1}{4}$$
$$y : \frac{16}{5} = \frac{9}{2} : \frac{9}{4}$$
$$y : \frac{16}{5} = \frac{9}{2} \cdot \frac{4}{9}$$
$$y : \frac{16}{5} = \frac{4}{2}$$
$$y : \frac{16}{5} = 2$$
$$y = 2 \cdot \frac{16}{5}$$
$$y = \frac{32}{5}$$
$$y = 6\frac{2}{5}$$
Ответ: y = 6 2/5