Why can you use cross products to solve the proportion 18/5 = x/100 for x? a. because 18 times 100 is equal to 5 times x, which means that x is equal to 36 b. because 18 times 100 is equal to 5 times x, which means that x is equal to 360 c. because 18 times x is equal to 5 times 100, which means that x is equal to 36 d. because 18 times x is equal to 5 times 100, which means that x is equal to 360