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r^3 = 384/48
r^3 = 8
r = 2
U5 = a 2^4 = 48
a (16) =48
a=3
U4 = ar^3 = 3 (2)^3 = 3 x 8 =24
ar^4 = 48
a = 48/r^4 .......[1]
u8 = 384
ar^7 = 384 .......[2]
substitusi [1] ke [2] didapat
substitusi r=2 ke [1] didapat
a = 48/r^4
a = 48/(2^4)
a = 48/16
a = 3
suku keempat :
U4 = ar^3
U4 = 3(2^3)
U4 = 3 (8)
U4 = 24