It's converted into a fraction because since it repeats, if you round it or cut it off after a certain point, it doesn't have the same value.
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9.555... repeating as an improper fraction in its simplest form is 86/9
To convert a one digit repeating decimal, make a fraction of that digit over 9, so 55/99 = 5/9 You can convert any repeating digits by putting them over the same number of 9s.
2/3 2/3 = 0.66666....
I assume that the decimal part is repeating to infinity. Then 1.571429 written as a fraction is 1 and 4/7.
3.72 = 372/100 = 93/25