The question says~

Find the number that makes the ratio equivalent to 1:4 ...

4:?

16

Step-by-step explanation:

The first number in the first ratio is 1, and the first number in the second ratio is 4.

That means the 1 is times by 4, making the 4 in the first ratio having to be times by 4, too.

4*4=16

1:4 = 4:16

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Step-by-step explanation:

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