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Solution: Here the given proportion is 3 : y = 12 : 9.

It can be expressed as a fraction in the form.

3 / y = 12 / 9

Now multiply both sides of the equation by y.

This gives 3 = 12 y / 9.

Now multiply both sides of the equation by 9.

This gives 12 y = 27.

Now divide both sides of the equation by 12.

So y = 27/12.

Hence the value of y for the given proportion = 9/4.

It can be expressed as a fraction in the form.

This gives, x / 5 = 1 / 2

Now multiply both sides of the equation by 5.

This gives 5 (x/ 5) = (1 / 2) (5).

x = 5/2.

Hence the value of x for the given proportion is 5/2.