Answer:
I divided the bar into 4 equal parts. I then moved the purple bar to the end of the first piece since we want 1 out of 4 pieces to be the purple bar.
Explanation:
As you can see in the picture, you want to try to divide the red bar into 4 pieces. Then, move the bar to the first mark you made. It makes that bar 1/4 of the original size of the red bar. Think of it like they are pieces. The red bar is 4 pieces, and the purple bar only needs to be one piece. Mark the first piece with the purple bar and you have your purple piece.