Find the fourth proportional to: (i) 4, 7, 20 (ii) 1.5, 2.5, 4.5
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Answer:
1) 4:7= 20:x
so 4/7=20/x
so x is equal to 20×7/4
so x is 35
2) 1.5/2.5=4.5/x
so x =4.5×2.5/1.5
7.5
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