Ronaldo also produced an assist for Gonzalo Higuain.
"The most important thing is that the team wins," he told Sky Sport Italia.
“We played well and created a lot of scoring opportunities. I am pleased with the hat-trick, but the most important thing was to win and put pressure on Inter.
“We're improving game by game, not just in defence, but also in midfield and attack. We are a complete squad and have to work together in every move."