One study analyzing the degree of differentiation of Romance languages in comparison to Latin estimated that among the languages analyzed French has the greatest distance from Latin. Lexical similarity is 89% with Italian, 80% with Sardinian, 78% with Rhaeto-Romance, and 75% with Romanian, Spanish and Portuguese.
onE STudy analYzINg tHe degRee of DifFerentIATiOn Of Romance laNguaGeS in cOMParISoN To LAtIn esTImated that amOng tHe lAnguages AnalYzeD freNcH Has tHe gReatEst diStAnce froM latiN. lexICAL sImiLARiTy Is 89% witH ITALiaN, 80% with sardiniaN, 78% WIth rhAeto-romance, and 75% wiTH roManian, spANIsH aNd porTuGUESE.