1024X768 is how many PPI on a 4" screen?

[saintforlife]

Assuming Apple squeezes the old iPad resolution into a 4" screen and 3:2 iPhone form factor, what kind of PPI will this give us? Can somebody do the math?

 

[JAT]

307.67 ppi long dimension
346.13 short

 

[saintforlife]

Thanks! So that is still borderline retina display. So will the older iPad apps just scale down and work on a 4" screen with the same 1024X768 resolution? Or will it mess up the UI elements like button/icons making them too big or too small and unusable? Can somebody that knows how iOS apps scale up and down between different resolutions comment?