we have SPQR similar to OLMN
so
SP/OL=PQ/LM=QR/MN=SR/ON
to find out MN
PQ/LM=QR/MN
QR/MN=SR/ON
SP/OL=QR/MN
therefore
substitute given values
6/3=5/x
5/x=8/4
4/2=5/x
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