Please can someone explain why this is happening?

as a simple example I draw a object 3x5 inches, then copy and paste then increase the copy size 110 % or one dimension by 1 inch with the padlock on the size increment is not equal?

if I draw a shape 3 x 5 inches and with the lock on change the 5 to 6 the 3 changes to 3.6 not 4

the same if with the lock on I change the percentage by 110 on one dimension the other does not increase the same amount.

why is that ?

if the object is square it does increase all side equally with either method and the lock on , or if i disable the lock and change the dimensions individually be a similar amount then i can achieve a oblong in a oblong with equidistant sides.

probably me being dumb again

Alistair