Question

Aflati termenul necunoscut din urmatoarele proportii:
a) x supra 5=7 supra 2
b)4 supra x= 9 supra 5
c) 11supra 5 =x supra 10
D) 4 supra 13=1supra x

Answer 1

$a) \frac{x}{5} = \frac{7}{2}$

$x = \frac{5 \times 7}{2} = \frac{35}{2} = 17.5$

$b) \frac{4}{x} = \frac{9}{5}$

$x = \frac{5 \times 4}{9} = \frac{20}{9} = 2.(2)$

$c) \frac{11}{5} = \frac{x}{10}$

$x = \frac{11 \times 10}{5}= 11 \times 2=22$

$d) \frac{4}{13} = \frac{1}{x}$

$x = \frac{13 \times 1}{4} = \frac{13}{4} = 3.25$