The Old Lady put in a solid first-half showing netting three goals in the opening 45 minutes, with Ronaldo accounting for two of the three strikes.
In doing so, Ronaldo became the first player in the top five European leagues to reach double figures in each of the last 15 seasons.
"The most important thing was to win, although we could've had more goals," Ronaldo told Sky Sport Italia.
"I think this is a good way of playing and it's important we must play with confidence. "
It's not about individual performances, but how we work as a collective."
Overall, Ronaldo has registered 11 goals in 19 appearances for the Italian champions this campaign.