Question

usando a propriedade fundamental das proporções encontre o valor de x
a) 3/4 = x/12
b)5/8 = 35/x
c)x/9 = 14/18
d)7/x = 1
e) 18/54 = 1/x

Answer 1

a) 3/4 = x/12

3/4 = X/12 = 9
4ₓ X= 12 ₓ 3 
4X= 36 
x= 36/4 = 9
X=9


b)5/8 = 35/x
5  ₓ X  =8 ₓ 35
5X = 280 
X =280/5 = 7 
X=56


c)x/9 = 14/18
9 ₓ X = 14 ₓ 9 
9X = 126
X= 126/9 = 7
X= 7


d)7/x = 1

X ₓ 1 = 7 ₓ 1 
X = 7

e) 18/54 = 1/x
18 ₓ X=  54 ₓ 1 
18X= 54
X= 54/18 = 3
X= 3