Responsive Portfolio

Page : http://www.streetbusinesses.com/london/mayfair/

It is set at 4 pictures width and when compressed in width it goes to 1 picture. However it breaks down from 4 to 1 at still quite a wide page width.

Is it possible for it to be 4 pictures wide then break down to 3 then to 2 (as it goes even slimmer) and lastly to 1 when it’s very slim?

Regards,
Greg