I'm not entirely sure what your exact question is, so I will answer multiple questions, hopefully one of them is yours.
If you want to calculate a number that is 30% less than 174, you multiply 174 by (100-30)%. So, 174 x 70% or 174 x 0.7 = 121.8
If you want to calculate a number that is 30% of the value of 174, you multiply 174 by 30%, or 174 x 0.3 = 52.2
If you want to know what number has 30% of its total equal to 174, you divide 174 by 30%, or 174/0.3 = 580. Therefore, the number 174 is equal to 30% of the number 580.
I hope one of those helped
