In a geometric sequence, the $23$rd term is $16$ and the $26$th term is $18$. What is the $24$th term?
18 / 16 = r^3
9 / 8 = r^3
r = (9/8)^(1/3)
24th term = 16 * (9/8)^(1/3) ≈ 16.64
+506 
