1/2/3/4 5/12/2/3 4/9/2/3
1/2 / 3/4 = 1*4/3*2 = 2/3 5/12 / 2/3 = 5*3/12*2 = 5/8 4/9 / 2/3 = 4*3/9*2 = 2/3