Ratio CalculatorWhat is the ratio of A to B equivalent to?

Changing a recipe for 4 servings to 3 servings.
200g : 4 servings = Xg : 3 servings → **X = (200 × 3) ÷ 4 = 150g**

If a trip for 5 people costs $500, how much would it be for 3 people?
$500 : 5 people = $X : 3 people → **X = ($500 × 3) ÷ 5 = $300**

On a map, 5cm represents 10km → How far is 2cm?
5cm : 10km = 2cm : Xkm → **X = (10 × 2) ÷ 5 = 4km**

If 10 people take 5 hours to complete a task, how long will it take for 8 people?
10 people : 5 hours = 8 people : X hours → **X = (5 × 8) ÷ 10 = 4 hours**

If an image is 800px wide and 600px high, what will its height be when the width is changed to 1200px?
800px : 600px = 1200px : Xpx → **X = (600 × 1200) ÷ 800 = 900px**