Going from Quechua to Mandarin Chinese (普通话) has a composite linguistic distance of 84% (heuristic estimate). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Latin → Chinese
Quechuan ↔ Sino-Tibetan
The 5 languages with the lowest linguistic distance from Quechua:
A quick 3-question check between Quechua and Mandarin Chinese. No signup.