4 : 2Taking FIRST TWO terms of the ratio(2I1) / I2 = 3/4 I1 / I2 = 3/8 = 6/16 I1 : I2 = 6 : 16Taking last two terms of the ratio , I2 / (8I3) = 4/2 I2/I3 = 16/1 I2 : I3 = 16 : 1 I1 : I2 : I3 = 6 : 16 : 1