Depends on how approximate is acceptable. The approximation of 22/7 is often quoted.
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It is an approximate value for pi
Because 22/7 is the approximate value of pi as a fraction but the exact value of pi has never been determined.
3.14
One can define an infinite number of fractions to successively approximate pi, and get closer and closer to pi's value. There is no closest fraction to pi. No matter how close the fraction is to pi you can always find one that is closer.
Pi is about 3.14159265. You can round that to as many or as few significant digits are are appropriate for a particular application.