find the value of a proportation
2/5:a::3/7:4/9
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2/5:a::3/7:4/9
Value of a is
= 3/7 x a = 2/5 x 4/9
= 3a/7 = 8/45
= 3a = 8/45 x 7
= 3a = 56/45
= a = 56/45 x 3
= a = 56/15
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