5:2
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It is: 18 to 12
You must have seen expressions such as 3:4::12:16, which reads 3 is to 4 as 12 is to 16. Sometimes encountered as 5:a::30:b, which is read 5 is to a as 30 is to b. Is this the type of ratio to which you refer.
Use the sine ratio: sine 30 = opposite/12 opposite = 12*sine 30 opposite = 6 inches
2 to 3
There are 12 inches to 1 foot, so the ratio is 12 to 1.