In a geometric sequence, the ratio between two terms is called r.
So x2/x1=r, x5/x4=r, etc.
Then x7/x6= x8/x7, which means x7 is the geometric mean for x6 and x8
X7/6= 216/x7. Now cross multiply
(X7)^2 = 6(216)
(x7)^2 = 1296
X7= sqr(1296) = 36
Hoping this helps!
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