To solve for \( r \) in the equation
\[ \frac{r}{17} = 13, \]
you can multiply both sides by 17 to isolate \( r \):
\[ r = 13 \times 17. \]
Now, let's calculate \( 13 \times 17 \):
\[ 13 \times 17 = 221. \]
So,
\[ r = 221. \]
Thus, the solution is
\[ \boxed{221}. \]