Each pair of figures is similar. use the information given to find the scale factor of the figure on the left to the figure on the right.

Scale factor is a 1 to 1 ratio, whereas volume is that 1 to 1 cubed.  So take the cubed root of each of those numbers and divide the number you get from the left by the number you get from the right to find that scale factor.  I'll do the first one for you, and then since all of them are volumes, they're all done the same exact way. 
.  This means that the figure on the left is 1.25 times larger than the one on the right.  That's the one-to-one.