Yes it is.
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0.185 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 rational form, is 185/1000. You can simplify this rational fraction if you so wish.
Oh, dude, like, totally. A rational number is any number that can be expressed as a fraction, and 1.85 can be written as 185/100, which is totally a fraction. So, yeah, 1.85 is indeed a rational number. Cool, right?
4.6 is rational.
No, it is rational.
0.38 is a rational number because it can be expressed as a fraction