By definition, "scale" means a "percentage of known measurements".
Scale always uses percentages. Scale doesn't accept nor does it calculate exact widths and heights of objects.
If you want to resize an object, or multiple objects, by specific measurements you need to use the Width and Height fields on the Transform Panel or Control Bar. If you are resizing multiple objects, you will probably need to do this one at a time.
Scale is never going to do what you are trying to do unless you manually calculate what percentage you need. i.e. 1.3 is 0.65% of 2, therefore you could enter .65% for the Scale dialog.