pada barisan geometri suku ke 2 = 27 dan suku ke 5 = 8 tentukan suku ke 7 tolong di jawab secepatnya

U2 = ar = 27
U5 = ar^4 = 8

U2/U5 = r/r^4 = 27/8
(1/r)^3 = (3/2)^3
1/r = 3/2
r = 2/3

U2 = ar = 27
a(2/3) = 27
a = 81/2

U7 = ar^6 = (81/2)(2/3)^6 = 2^5 /3^2 = 32/9