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The aspect ratio that is most commonly associated with CRT (cathode-ray tube) monitors is 4:3. This traditional aspect ratio reflects the dimensions of the screen, where the width is 4 units for every 3 units of height. During the height of CRT technology, this aspect ratio was prevalent for television screens and computer monitors, providing a more square-shaped display which was well-suited for the resolution formats of that era.

In contrast, modern displays have transitioned more towards widescreen formats, such as 16:9 and 21:9, which align better with contemporary video content and gaming. The 5:4 aspect ratio did exist but is less commonly referenced compared to the more standard 4:3 ratio. Thus, when considering historical context and typical production of CRT monitors, 4:3 is indeed the correct and most representative aspect ratio.