How to "Scale" the quantity of ingredients of dishes around one single ingredient??

Let me elaborate a bit.

Lets say the original recipe has the following ingredients:-

Chicken 400g

Corn Flour 100g

Eggs 4

Now the "Single Ingredient" around which i want to rescale the dish is Chicken.

So lets say now i only want to use 300g chicken. This means that the quantity of the chicken is now 75% of its original quantity.

So does that mean i have to scale the other ingredients to 75% of their original quantity too??

Or does it not work that way??

Also btw, the above recipe was made up completely on the spot for example purposes and doesn't exist IRL.