\[\frac{9^{3} \cdot 16^{2}}{36^{4}} = \frac{9^{3} \cdot \left( 4^{2} \right)^{2}}{(9 \cdot 4)^{4}} = \frac{9^{3} \cdot 4^{4}}{9^{4} \cdot 4^{4}} = \frac{1}{9}.\]