Hey there!!
To simplify ratios, in fraction, we find the LCM of the denominators and multiply all the number with the same number to receive the desired answer.
Denominators - 4 , 3 , 1 , 1
Hence, the LCM = 12
So now multiply all the numbers with 12.
12 ( -3/4 ) : 12 ( 2/3 ) : 12 ( 1 ) : 12 (1 )
-9 : 8 : 12 : 12
Hence, the required answer is -9:8:12:12
Hope my answer helps!!!