X:8/9=3:4 х:2,8=5:7 6:5=9:х

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Let's solve these proportions:

1) 8/9 = 3/
Cross multiply
8 4 = 3
9 3 = 27

So, 8/9 = 3/4 simplifies to 32 = 27, which is not true. Therefore, there is no solution for this proportion.

2) x/2.8 = 5/
Cross multiply
x 7 = 2.8
7x = 1
x = 2

So, x = 2 is the solution for this proportion.

3) 6/5 = 9/
Cross multiply
6 x = 5
6x = 4
x = 45/
x = 7.5

So, x = 7.5 is the solution for this proportion.