19 out of 25 liked it so 19/25 liked it
19/25 = 0.76
227 x 0.76 = 172.52 so about 172 people liked it
Note: I was taught when rounding the number of people, always round down, because you cannot have a partial person ( 0.52 of a person). But depending on the teacher or program used, you may need to round up to 173 people.