Answer
90000 people are expected to vote.
Work Step by Step
Let X represent the number of people expected to vote.
Three out of every seven eligible voters are going to vote, so the ratio is $\frac{3}{7}$.
Now, let’s set up a proportion with the ratio given and a ratio which compares the corresponding number of people.
So, $\frac{3}{7}$ = $\frac{X}{210000}$
To solve this equation, we equate the cross products.
3 $\times$ 210000 = 7 $\times$ X
630000 = 7X
X = 90000
