We have: \(\frac{1}{5}\) = \(\frac{1.4}{5.4}\) = \(\frac{4}{20}\)
Ta có: \(\frac{1}{5}\) = \(\frac{1.4}{5.4}\) = \(\frac{4}{20}\)
For \(\frac{4}{x}\) = \(\frac{1}{5}\)
Để \(\frac{4}{x}\) = \(\frac{1}{5}\)
=> \(\frac{4}{x}\) = \(\frac{4}{20}\)
So x = 20
Vậy x = 20