#### Answer

A traveler would get 240 Euros for 300 US dollars.

#### Work Step by Step

Let X represent the amount of Euros a traveler could get for 300 dollars.
The exchange rate is 4 Euros for 5 United States dollars, or $\frac{4}{5}$.
Now, let’s set up a proportion with the ratio given and a ratio which compares the amount of Euros to the amount of dollars.
So, $\frac{4}{5}$ = $\frac{X}{300}$
To solve this equation, we equate the cross products.
4 $\times$ 300 =5 $\times$ X
1200 = 5X
Divide both sides by 5.
X = 240
A traveler would get 240 Euros for 300 US dollars.