* Older laptop computers with a pointing device that did not take up space such as a pointing stick (Trackpoint) or trackball attached to the side of the machine could accommodate a keyboard which matched a 16:9 screen well. The use of touchpads, which require a lot of space below the keyboard, and the removal of keys such as the Numeric keypad more accurately matches the 4:3 ratio of a screen found on smaller netbooks and laptops.
Conversion
For word processing and office type applications, vertical measurement can be more important than diagonal measurement when determining size requirements. When monitors are sold the quoted size is the diagonal measurement of the display area. Because of the different ratio, a 16:10 monitor will have a smaller vertical size than a 4:3 monitor of the same advertised size. To find the diagonal measurement of widescreen monitor that would have the same vertical measurement as a known 4:3 monitor, you must multiply the diagonal measurement of the 4:3 monitor by 1.132. Via a similar calculation, to convert between the diagonal measurement of a 5:4 monitor to the diagonal measurement of a 16:9 monitor having the same vertical measurement, one would multiply by 1.274.
For example to have the same vertical height as a 4:3 19" monitor, a 16:10 widescreen monitor would need to be (19" x 1.132 ) = 21.508". Furthermore, to have the same vertical height as a 5:4 17" monitor, a 16:9 widescreen monitor would need to be (17" x 1.274) = 21.658".
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