Question

find the ratio of third proposional to 12 and 30 and mean proposional between 9 to 25

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Answer 1

third proportional to 12 and 30

12:30::30:c

c=900/12=75

mean proportional to 9 and 25

9:b::b:25

b*b=25*9

√b*b=√5*5*3*3

b=5*3=15