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a = 4
U₅ = ar⁴ = 100
Sehingga,
4.r⁴ = 100
r⁴ = 25
r² = 5
r = √5
Maka,
Nilai suku-sukunya adalah:
4, 4√5, 20, 20√5, 100
Sehingga,
a = 4√5
b = 20
c = 20√5
Didapat:
ac/b
= 4√5 x 20√5 / 20
= 4√5 x √5
= 4 x 5
= 20