4.55 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. And, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is 455/100. You can simplify this rational fraction if you so wish.
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45.5 is equal to 455% which also equals 455/100
455 is not a fraction but an integer. It may be written as 455/1 in which case the denominator is 1.
0.0769
.455
It is a unit fraction.