As if the depression was someone else's problem, Koichi became wealthier and wealthier.
I think Viet comes from a wealthy family.
My parents are not super rich but they are relatively wealthy.
You have such abundant luck! When you have abundant luck, most people probably would think you also have a lot of wealth, because lots of wealth equals lots of luck, right?
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.