barisan bilangan 1/4√2,1/2,1/2√2,1,.....mempunyai rasio....

1/4√2 , 1/2 , 1/2√2 , 1

U1 = 1/4√2
U2 = 1/2

Rasio (b) :
b = U2 / U1
b = (1/2) / (1/4√2)
b = 1/2 × 4/√2
b = 2/√2
b = 2/√2 × √2/√2
b = 2√2 / 2
b = √2