We have two geometric sequences of positive real numbers:
6,a,b and a,b,1296
Solve for a
+37159 6*r *r = b
a*r = b
a*r = 6 * r * r
a = 6 * r
a * r * r = 1296
6*r *r * r = 1296
r = 6
6 * r * r = b
b = 216
then a = 36
+37159 6*r *r = b
a*r = b
a*r = 6 * r * r
a = 6 * r
a * r * r = 1296
6*r *r * r = 1296
r = 6
6 * r * r = b
b = 216
then a = 36
