8/9=4x/27? 0.25/4× +1 =0.3/8.4? 6/7 =10×/21?

[latex] frac{8}{9} = frac{4x}{27} \ 8*27=4x *9\ x= frac{8*27}{9*4} \ x= frac{2*3}{1} \ x=6.[/latex][latex] frac{6}{7}= frac{10x}{21} \ 10x*7=6*21 \ x= frac{6*21}{10*7} \ x= frac{9}{5} \ x=1.8[/latex]