It is: 1 to 4
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3/5 is the same as 12/20 because they are equivalent fractions.
Well, it really is quite simple. The definition of proportion is finding two ratios that are equal. So for example, if the ratio of dogs to cats was 4:5 and there were 20 animals in total, and you needed to figure out how many dogs there are, then you would first have to figure out if it was a part to part or a part to whole. This is a part to part. Then you would write out your proportion- which in this case would be 4 = x For every 5 cats, there are 4 dogs, so you would find your answer. --- --- 5 20
5/3
If you cross-multiply and you obtain an equality, then the proportion is true. Example: 2/3 = 20/30 ? cross-multiply; 2 x 30 = 3 x 20 ? 60 = 60 Since we have an equality, the proportion is true.
To find the number that 5 is 20% of, you can set up a proportion: 5 is to x as 20 is to 100. This can be written as 5/x = 20/100. Solving for x, we get x = (5 * 100) / 20 = 25. Therefore, 5 is 20% of 25.