Two similar rectangles are shown.

Rectangle ABCD and rectangle LMNO are shown side by side. In rectangle ABCD, only side BC is labeled and the side has a length of 9 centimeters. In rectangle LMNO, side LM has a length of 6.75 centimeters, and side MN has a length of 4.5 centimeters.

Complete the statement below by moving the correct proportion to the box.