A proportion is a statement that two quantities are equal.
If two ratios are equal, then
Example :
Find the missing value in the given proportion.
(1) 2 : 5 = 6 : x
(2) 16 : 20 = x : 35
(3) 3 : 4 = 6 : x
(4) 3 : 6 = 12 : x
(5) 2 : 5 = x : 15
(6) 7 : 21 = x : 33
(7) 15 : 25 = 30 : x
(8) x : 18 = 32 : 48
(9) 5 : 100 = x : 40
(10) x : 12 = 33 : 44
Solution :
(1) 2 : 5 = 6 : x
Product of extremes = Product of means
2x = 5(6)
2x = 30
x = 15
(2) 16 : 20 = x : 35
16(35) = 20x
x = 16(35)/20
x = 28
(3) 3 : 4 = 6 : x
3x = 4(6)
x = 24/3
x = 8
(4) 3 : 6 = 12 : x
3x = 6(12)
x = 72/3
x = 24
(5) 2 : 5 = x : 15
2(15) = 5x
x = 30/5
x = 6
(6) 7 : 21 = x : 33
7(33) = 21x
x = 7(33)/21
x = 11
(7) 15 : 25 = 30 : x
15(x) = 25(30)
x = 25(30)/15
x = 50
(8) x : 18 = 32 : 48
x(48) = 18(32)
x = 18(32)/48
x = 12
(9) 5 : 100 = x : 40
5(40) = 100x
x = 5(40)/100
x = 2
(10) x : 12 = 33 : 44
x(44) = 12(33)
x = 12(33)/44
x = 9
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