It is: 721/10
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7.21 = 721/100
4.721 as a fraction is 4721/1000 or 4 and 721/1000 as a mixed fraction.
72.1 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 721/10.
0.0055
375 +346 = 721