Convert 950 US dollars to British pound sterling. Use 1 US dollar = 0.62 British pound sterling.

1/0.62 = 950/x ... 1 U. S. dollar to 0.62 pounds = 950 dollars to x pounds

and since this is a proportion, we cross multiply

(1) (x) = (0.62) (950)

x = 589 ... so 950 U. S. dollars is equivalent to 589 British pounds