Technically, yes. But frequently both elements of a ratio would be multipled up to get rid of the fraction.
So a ratio of 2 : 2.25 is valid, but one would multiply both by 4 to get the equivalent ratio 8 : 9.
A ratio involving a fraction is normally used only when there is a very good reason for the one of the elements of the ratio to be shown as a "round" number.
For example, a map scale would be given as "1 inch to 4.5 miles" rather than the equivalent "2 inches to 9 miles" so as to ensure that one of the elements of the ratio is 1.
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If the ratio is 4 out of 5, the fraction is 4 divided by 5, which is 0.8.
63 is an integer, not a fraction.
-6.59 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in the form of a ratio, is -695/100. You can simplify that ratio if you so wish.
Convert the ratio to fraction first, then convert the fraction to decimal. Example: ratio = 3 : 4 3 : 4 = 3/4 = 0.75
0.625 is a fraction. The fact that it is expressed as a decimal does not mean it is not a fraction. As a ratio, it can be written as 625/1000. You may simplify that ratio if you so wish.