SOLUTION: If 3,x,12 are in continued proportion, find the value of x

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Question 859000: If 3,x,12 are in continued proportion, find the value of x
Answer by mananth(16946) About Me  (Show Source):
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Since 3,x,12 are in continued proportion,
3/x = x/12
cross multiply
x^2= 36
x= +/-6