Proportions?

[Dillinger4]

Ive been looking at some problems dealing with proportions lately and from what i understand if an object is proportional it is said to be in direct variation or directy proportional. If the object is not proportional it is said to be in indirect variation or inversely proportional.

Indirect variation y = k / x
Direct variation y = kx

Now with the indirect variation formula i can see that when x increases y decreases. This seems natural since we are dividing the constant k by a increasing divisor.

Now for the direct variation formula it seems that in order to acheive proportion a constant of one would have to be used.

y = kx
2 = 1 * 2
3 = 1 * 3

I cant see how proportion would be acheived any other way. Any help or suggestions would be great.