Use two of the 3s to make 33.
Then:
33 - 3 = 11
11 + 3 = 14
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3 * 3 / ( 3 * 3 ) = 1 but that uses only four 3s, so 33 / ( 3 * 3 * 3 ) = 1 uses five 3s
33 + (3/3)
33 x 33/3 = 33 x 11 = 363
28 3s
4 3s = 4*3 = 12, which is a rational number.