Question

determine o valor de x nas proporções

a) 15 30
__ = ____
4 x

b) 3 x
___ = __
5 10
c) 1 3
__ = __
x 9

d) x 1
__ = __
15 5

e) x 3
__ = __
9 1

g) 5 3
__ = __

Answer 1

Resposta:

$a) \frac{15}{4} = \frac{30}{x}$

15.x = 30 . 4

15x = 120

x = 120/15

x = 8

$b) \frac{3}{5} = \frac{x}{10}$

5.x = 10 . 3

5x = 30

x = 30/5

x = 6

$c) \frac{1}{x} = \frac{3}{9}$

3.x = 9 . 1

3x = 9

x = 9/3

x = 3

$d) \frac{x}{15} = \frac{1}{5}$

5.x = 15 . 1

5x = 15

x = 15/5

x = 3

$e) \frac{x}{9} = \frac{3}{1}$

1.x = 9 . 3

x = 27

g) ????