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Proportions

Is 3:5 and 12...

Question

Is 3:5 and 12:20 in a proportion? Why not?

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Solution

Yes, they are in proportion.
For a set of ratios a:b and c:d to be in proportion (a:b :: c:d) , they should satisfy the condition
$b \times c = a \times d$
For 3:5 and 12:20,
$5 \times 12 = 3 \times 20$
60 = 60
Hence they are in proportion.

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Is this True or False?

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