Real world proper scaling


i have an srtm elevation file (1 arc second) wich give me these informations in microdem :
DEM size: 3601x3601
z range: -10 to 1052 m
4-byte real
Elev units: meters
space: 1x1"
(about 25.17x30.82 m)

how to scale the imported terrain in UE4 to get 1:1 mapping please ?

my first guess was : x : 2517 , y : 3082 , z : ?
but after tryiyng it seems that changing the scale is uniform even if i unlock the little lock .

so please what’s the proper scale for this particular file in X : Y : Z ?

thanks .