How many wins do I need to get from Bronze 3 to Master?

With a 55% win rate, you need to play 1000 games, win 550 of them and lose 450.

With a 60% win rate, you need to play 500 games, win 300 of them and lose 200.

With a 65% win rate, you need to play 333 games, win 216 of them and lose 117.

With a 70% win rate, you need to play 250 games, win 175 of them and lose 75.