recipe ratio is 3:5 pecans to chocolate chips.
equivalent ratio for larger cookies could be 6:10 9:15 12:20 (supersized!).
If you allow fractions of a pecan/chocolate chip (unlikely, sounds like a hassle, but could be easier with ounces of floor, cups of sugar, etc.) then you could do smaller 1.5:2:5 or larger 4.5:7.5.
Ratio is like a fraction, so you can think of a 3:5 ratio like 3/5 fraction. Equivalent fractions are when you multiply (or divide) the top AND the bottom by the same number. The same is true of ratios.