I'll be flying in on the 'fourth'. [=the fourth day of the month]
He got a base hit in the 'fourth'. [=the fourth inning]
She drank a 'fourth' of the bottle.
(..) is what's happening now, Bob. And you are missing this! I can't believe you don't want to go to your own son's graduation. It's not a graduation. He's moving from fourth to fifth grade. - It's a ceremony! - It's psychotic! They keep creating new ways to celebrate mediocrity (..)2004 The Incredibles