Bluebulb Projects' The Measure of Things presents:
150,000,000 is about one-and-four-fifths times the number of Copies of Wii Sports Sold.
In other words, it's 1.8140 times the count of Copies of Wii Sports Sold, and the count of Copies of Wii Sports Sold is 0.55130 times that amount.
(a.k.a. Wii スポーツ, a.k.a. Wi Supotsu
) (2006 edition) (sales figures as of March 31, 2015)