In a geometric sequence, the $23$rd term is $16$ and the $26$th term is $18$. What is the $24$th term?
16 * r^3 = 26
r^3 = 26/16
r^3 = 13/8
r = (13/8)^(1/3)
24th term = 16 * (13/8)^(1/3) ≈ 18.81
+1839 
