Slant height of a pyramid

The ratio of the height of the pyramid to the edge of the square base is 1.5 to 1. The height of the pyramid is 3 meters. What is the **approximate** length of the slant height of the pyramid?

A. 4.4 m

B. 3.2 m

C. 2.8 m

D. 1.4 m

I am not sure what the ratio part means, but I thought maybe

using a proportion

(1.5/1)=(3/x)

so x=2

and then using a triangle (pyth. thm.) 3^2 + 2^2 = c^2 (slant height)

so I got sqrt (13) which equals 3.6

which the answer is supposed to be 3.2 but I do not think I did this correct because the answers are not close enough.