China dwarfs Peru: about 9,371,225 km² km² against 1,296,279 km² km². At true size China is about 7.2× larger — the whole of Peru fits into China roughly 7 times.
China sits in Asia, Peru in South America. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 7.2×.
The old map muddied it further: Mercator inflates China about 1.6× and Peru about 1×, so on a Mercator-style map this pair appears 10.9× apart instead of the true 7.2×.
Peru fits 7× into China.