Judgment question: by 2, 3, 4, 5 four numbers, can form a proportion ()

Judgment question: by 2, 3, 4, 5 four numbers, can form a proportion ()

If 2:3, the other ratio should be 4:6 or 5:15 / 2, if 2:4 = 1:2, the other ratio should be 3:6 or 5:10, if 2:5, the other ratio should be 3:15 / 2 or 4:10, if 3:4, the other ratio should be 2:8 / 3 or 5:20 / 3, if 3:5, the other ratio should be 2:10 / 3 or 4:20 / 3