\[1)\ x\ :y = 11\ :6\]
\[x = \frac{11y}{6}.\]
\[2)\ y\ :z = 5\ :\frac{1}{6}\]
\[z = \frac{y}{6 \cdot 5} = \frac{y}{30}.\]
\[3)\frac{11y}{6} + y + \frac{y}{30} = 172\]
\[\frac{55y + 30y + y}{30} = 172\]
\[86y = 5160\]
\[y = 60.\]
\[4)\ x = \frac{11y}{6} = \frac{11 \cdot 60}{6} = 110.\]
\[z = \frac{y}{30} = \frac{60}{30} = 2.\]
\[Ответ:172 = 110 + 60 + 2.\]