Question

God, somebody help me!!!

Find the missing proportion:
3 : 9 = 2 : _
57 : _ = 19 : 38
7 : _ = 2 : 3
15 : 2 = _ : 8
0.3 : 4 = 9 : _

Answer 1

Explanation:

When solving proportions like these, you can set them up using fractions

#1:

`(3)/(9) = (2)/(x)\\(1)/(3) = (2)/(x)\\cross \: multiply\\x = 6\\3:9 = 2:6`

#2:

`(57)/(x) = (19)/(38)\\(57)/(x) = (1)/(2) \\x = 114\\57 : 114 = 19 : 38`

#3:

`(7)/(x) = (2)/(3) \\21 = 2x\\x = (21)/(2) = 10.5\\7:10.5 = 2:3`

#4

`(15)/(2) = (x)/(8)\\x = (15*8)/(2) = 60\\15:2 = 60:8`

#5

`(0.3)/(4) = (9)/(x)\\0.3x = 36\\x = (36)/(0.3) = 120 \\0.3:4 = 9:120`