(1) 1 4 : 1 12 =8:x, 1 4 x= 1 12 ×8, 1 4 x= 2 3 , x= 2 3 ÷ 1 4 , x= 8 3 ;(2)4x+16=21.68, 4x+16-16=21.68-16, 4x=5.68, x=5.68÷4, x=1.42.