Question

calcule o valor de x em cada proporção
a) x/5 = 6/3
b)4/x = 6/9
c) 4/7 = x/ 21
d) 9/12 = 6/x

Answer 1

a)
x/5 = 6/3 
x.3=5.6
x=30/3
x=10 


b)
4/x = 6/9
x.6=4.9
x=36/6
x=6 


c)
 4/7 = x/ 21 
7.x=4.21
x= 84/7
x=12


d)
9/12 = 6/x
x.9=12.6
x=72/9
x=8

Answer 2

Olá, boa noite ☺

Resoluções:

a)

x/5 = 6/3
3x=6.5
3x=30
x=30/3
x=10

b)

4/x = 6/9
6x=9.4
6x=36
x=36/6
x=6

c)

4/7 = x/ 21
7x= 21 . 4
7x=84
x=84/7
x= 12

d)

9/12 = 6/x
9x=12.6
9x=72
x=72/9
x=8

Bons estudos :)