For cooking "The Great Cheesecake", a good chef need 2 kilos of flour and 3 kilos of cheese, more talent and a bunch of joy.
If you needed to triple the recipe, you'll need 6 kilos of flour and 9 kilos of cheese, but the rate wouldn't change because:
[tex] \frac{6}{9} = \frac{2}{3} [/tex]