What same number should be added to each of the numbox 2, 7, 10 and 25 so that they form a proportion?
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Step-by-step explanation:
Let c be the required number so that 2+c, 7+c, 10+c, and 25+c are in proportion.
then (2+c)(25+c)=(7+c)10+c)
50+27c+c^2=70+17c+c^2
10c=20
c=2
So the required number is 2 and the given numbers becomes 4,9,12,27.
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