The ratio of the 3rd term and the 7th term of an arithmetic province is 5:7.What is the ratio of the 4th to the 8th term?
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a+2d/a+6d=5/7
cross multiply
7(a+2d)=5(a+6d)
7a+14d=5a+30d
2a=16d
a=8d
ratio of 4th to 8th term is
a+3d/a+7d=8d+3d/8d+7d
=11d/15d=11/15
ratio of 4th term and 8th term is 11:15
cross multiply
7(a+2d)=5(a+6d)
7a+14d=5a+30d
2a=16d
a=8d
ratio of 4th to 8th term is
a+3d/a+7d=8d+3d/8d+7d
=11d/15d=11/15
ratio of 4th term and 8th term is 11:15
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