Should I use ratio, rate, fold, or increase?

The amounts of ingredients a, b and c in A (solution) were 1, 2 and 3, respectively.
I have prepared B, C and D solutions with the ingredients as below.

The amounts were multiplied by 1.5 for solution B, resulting in a,b,c having the amounts of 1.5, 3, 4.5, respectively.
The, the amounts were multiplied by 3 for solution C, resulting in a,b,c having the amounts of 3, 6, 9 respectively.
Also, the amounts were multiplied by 0.5 for solution D, resulting in a,b,c having the amounts of 0.5, 1, 1.5 respectively.

As above, based on the amounts of ingredients of solution A, the amounts of the ingredients of B,C,D were determined by multiplying a specific number to A.

Then, how can I express these changes collectively regarding the preparation of solutions B,C and D?

1. B, C and D solutions were prepared according to the recipe (composition?) in which the amount of each ingredient was increased or decreased at a specific rate as compared to A

2. B, C and D solutions were prepared according to the recipe in which the amount of each ingredient was changed with a specific fold increase or decrease as compared to A

3. B, C and D solutions were prepared according to the recipe in which the amount of each ingredient was changed by (with? according to?) a specific ratio in relation to A