Let the three consecutive terms of G.P. be a/r, a, ar.
Product of three terms = 216
(a/r) x a x ar = 216
a3 = 216
a3 = 63
a = 6
Sum of their products in pairs = 156
When a = 6 ; r = 3
a/r = 6/3 = 2
a = 6
ar = 6 x 3 = 18
a = 6; r = 1/3
a/r = 6 x (3/1) = 18
a = 6
ar = 6 x (1/3) = 2
The three terms are 2, 6, 18 or 18, 6,2.