Suatu barisan geometri Diketahui U3=32 U6=2.048 Ditanya u4..? Di bantu ya

ar^5/ar^2 = 2.048/32
r^3 = 64
r = 4

ar^2 = 32
a(4)^2 = 32
16a = 32
a = 2

U4 = ar^3
U4 = 2x(4)^3
U4 = 2x64 = 128