If we down-scale 1440p by 56.25%, we get 1080p. And we up-scale 1080p by 177.78%, we get 1440p.
To get these values:
Multiply the width and height of a resolution, i.e., 2560 by 1440 and 1920 by 1080.
Divide both results with each other, i.e., 2,073,600 / 3,686,400.
Multiply the end result by 100, i.e., 1.778 x 100 = 177.78%.
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