Find the values of x for which the following ratios are in proportion:
(a) 3:4 :: x:20
(b) x: 48 :: 18:12
(c) 7:21 :: 22: x
(d) 12:x :: 8:30
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Answer: 1(15)' 2(72)' 3(66)' 4(45)
Step-by-step explanation:
(1). 3/4=x/20
=4x=20×3
=x=20×3/4
=15
(2). x/48=18/12
=12x=48×18
=48×18/12
=72
(3). 7/21=22/x
=7x=22×21
=22×21/7
=66
(4). 12/x=8/30
=8x=30×12
=30×12/8
=45. (Answer)
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