First, let's simplify inside the parentheses:

4,51 2/3 = 4,5(5/3) = 4,5*(1,67) = 7,505

7,505 - 6,75 = 0,755

Now let's calculate the final result:

0,755 (4/3)³ = 0,755 (64/27) = 0,755 * 2,370 = 1,787

Therefore, the final result is 1,787.