3 4/9 x 4 = 13.7 recurring (that is, 13.7777...) or 13 7/9.
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4/9ths is bigger than 3/7ths because a common denominator is 63. 4/9ths=28/63rds and 3/7ths=27/63rds. 28/63rds is slightly bigger than 27/63rds so that means that 4/9ths is slightly larger than 3/7ths.
0.4444444444 . . .
.444444444444 continuously
19/21. 4/7 + 3/9 = 36/63 + 21/63 = 57/63 = 19/21.
4/9 x 9 = 4.