According to Ethnologue, the lexical similarity between Catalan and other Romance languages is: 87% with Italian; 85% with Portuguese; 80% with Spanish; 76% with Ladin; 75% with Sardinian; and 73% with Romanian.
What is the similarity between Catalan and Italian? Hoe similar is Catalan to Portuguese? What is the percent relationship of Catalan to Spanish? What is the relationship similarity to Ladin? How related is Sardinian to Catalan?