4.72 is a rational number because if so required it can be expressed as fraction in the form of 118/25 in its lowest terms.
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4.72 is rational. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
Rational
10.01 is a rational number
rational
It is a rational number
Such a product is always irrational - unless the rational number happens to be zero.