jacob used 1/7 of liter of water to fill 1/9 of the fish aquarium. how many liters of water are needed to fill the aquarium

To find the result we can use proportion[tex] \frac{1}{7} --------------- \frac{1}{9} \\ x ---------------1[/tex]Now we have crossmultiply, so[tex] \frac{1}{7}*1= \frac{1}{9} *x [/tex]      /*9     (multiply both sides by 9)[tex] \frac{9}{7}=x [/tex] - its the result