\[\frac{4a^{2}b}{3c^{2}}\ :\frac{2a^{8}}{b^{2}c^{6}} =\]
\[= \frac{4a^{2}b \cdot b^{2}c^{6}}{3c^{2} \cdot 2a^{8}} = \frac{2b^{3}c^{4}}{3a^{6}}.\]