compare third column of one file with the first column of another

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ptt.txt 
Location Strand Length PID Gene Synonym Code COG + Product 1..1524 + 5
+07 15607143 dnaA Rv0001 - COG0 +593L chromosomal replication initiato
+r protein DnaA 2052..3260 + 402 15607144 dnaN Rv0002 - COG0592L + DNA
+ polymerase III subunit beta 3280..4437 + 385 15607145 recF Rv0003 - 
+COG1195L + DNA replication/repair protein RecF

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mapped.txt
gi|50953765|ref|NC_002755.2|-587160 83 gi|448814763|ref|NC_00096 +2.3|
+ 1329307

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$file="mapped.txt";
...


}}}

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