Add two, three and six to form a proportion

Add two, three and six to form a proportion


Match 1:
1: 3 = 2:6 or 1:2 = 3:6
Match 4:
2: 4 = 3:6 or 2:3 = 4:6
Matching 9:
2: 6 = 3:9 or 2:3 = 6:9



2, 4, 20 and 1 are used to form two proportional expressions: () and ()


0.2:4=1:20
4:0.2=20:1
0.2:1=4:20
.



Write all the proportions of 5, 25, 6 and 30


5:6=25:30
5:25=6:30
6:5=30:25
25:5=30:6