Why does the Boeing 747-400 have 3 engine types?

One iconic plane, three very different engines. Unravel the mystery of the 747-400's multi-engine design and the strategic ...
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Why Did Boeing Build The 747 With 4 Engines?

The Boeing 747 Jumbo stands out for being the most popular quad-engined commercial passenger jet to exist. It also boasted the longest production run of any commercial jet in its class. But why was it ...