What's the definition of "Equality of cross products"

Answer: Every proportion has 2 cross products. In the proportion 224/100 = 336/150, the cross products are 224 times 150 and 100 times 336.

A vector perpendicular to two given vectors, u and v, and having magnitude equal to the product of the magnitudes of the two given vectors multiplied by the sine of the angle between the two given vectors, usually represented by u * v.