\[\boxed{\mathbf{692\ (692)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ Выразим\ \text{x\ }через\ y:\]
\[x\ :y = 4\ :9\]
\[9x = 4y\]
\[x = \frac{4}{9}y\]
\[2)\ Выразим\ \text{z\ }через\ y:\]
\[y\ :z = 15\ :2\frac{2}{3}\]
\[15z = 2\frac{2}{3}y\]
\[z = y \cdot 2\frac{2}{3}\ :15\]
\[z = y \cdot \frac{8}{3} \cdot \frac{1}{185} = \frac{8y}{3 \cdot 15} = \frac{8}{45}y\]
\[3)\frac{4y^{\backslash 5}}{9} + y^{\backslash 45} + \frac{8y}{45} = 219\]
\[\frac{20y + 45y + 8y}{45} = 219^{\backslash 45}\]
\[73y = 9855\]
\[y = 135.\]
\[4)\ Получаем:\]
\[Ответ:219 = 60 + 135 + 24.\]