To find the percentage of something, you just need to find the ratio between the wanted amount, by the total amount, and then convert to a fraction of 100.
In our particular case, the amount we want is the amount of visitors of website A, and the total amount is the total of visitors of all sites.
First, let's calculate the total of visitors of all sites(to do that, we just need to sum all the values):
[tex]T=371+275+263+179+108=1196[/tex]Now, we can write our ratio as:
[tex]\frac{A}{T}=\frac{371}{1196}[/tex]Converting this to a fraction of 100, we get the following expression
[tex]\frac{371}{1196}=\frac{x}{100}[/tex]Now, we just need to solve for 'x' to find our percentage.
[tex]\begin{gathered} \frac{371}{1196}=\frac{x}{100}\Rightarrow100\cdot\frac{371}{1196}=x\Rightarrow x=31.0200668896\ldots \\ \Rightarrow x\approx31 \end{gathered}[/tex]And this is our final result. 31% of the visitors of these five sites was due to Website A.