Diantara nilai x berikut yang memenuhi proporsi x/7=21/49 adalah...... A

[tex] \frac{x}{7} = \frac{21}{49} \\ \frac{x}{7} = \frac{3}{7} \\ 7.x = 3 \times 7 \\ 7.x = 21 \\ x =3[/tex]