Question:
Suppose that  $4^{a}=5$, $5^{b}=6$, $6^{c}=7,$ and  $7^{d}=8$. What is $a\cdot b\cdot c\cdot d$?

Answer:
Because \[
4^{a\cdot b\cdot c\cdot d}
= \left(\left(\left(4^a\right)^b\right)^c\right)^d
= \left(\left( 5^b\right)^c\right)^d
= \left(6^c\right)^d = 7^d = 8 = 4^{3/2},
\]we have $a\cdot b\cdot c\cdot d = \boxed{\frac{3}{2}}$.