The voting was held on Thursday, where Ryan easily defeated Democratic nominee and Minority Leader Nancy Pelosi with 236 votes to 184.
The victory was effectively determined on Wednesday since the Wisconsin congressman had secured the position the day before by winning the support of most Republican representatives in a closed-door election to become the party's candidate.
He beat GOP Representative Daniel Webster, a former Speaker in the Florida statehouse, in a 200-43 vote on Wednesday.
Ryan, 45, has been in Congress for 17 years and enjoys strong ties with all wings of the Republican Party. He is the former chairman of the House Budget Committee and current head of the Ways and Means Committee.