1)x:8/9=3:4 2)x:2,8=5:7 3)12:7=9:x

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вопрос

1) To find x in the first equation, we can set up a proportion:

8/9 = 3/4

Cross multiply to solve for x:

8 4 = 9 3
32 = 27

This is not true, so there is no solution for x in this equation.

2) To find x in the second equation, we can set up a proportion:

x/2.8 = 5/7

Cross multiply to solve for x:

x 7 = 2.8 5
7x = 14
x = 14/7
x = 2

Therefore, x = 2 in this equation.

3) To find x in the third equation, we can set up a proportion:

12/7 = 9/x

Cross multiply to solve for x:

12 x = 7 9
12x = 63
x = 63/12
x = 5.25

Therefore, x = 5.25 in this equation.