Yes - all integers, including 90, are rational numbers.
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It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
The answer to the question that is given is 344444444/1000000000. This simplifies to 86111111/250000000.However, if your original number was meant to be 0.344... recurring, the answer is 31/90.