Missing image aspect ratio Internet Explorer 6 and 7

When dealing with missing images, it apears that IE applies a roughly 1 : 1.1429 aspect ratio to the box it draws.
These values are applied when using CSS or IMG attributes and are available via DOM as well (offsetWidth and offsetHeight).

width:100px (results in height:114px)

width=100 attribute (results in height:114px)

height:114px (results in width:100px)

width:200px (results in height:229px)

width:400px (results in height:457px)