I have already found several questions and answers about this topic but I simply cannot get this to work for me.
 
        
Try proportional height and width. You need to make constraints for Equal Heights and/or equal Widths and then you double click on the constraint and change the multiplier for example 0.2 if you wish to make First Item to be 20% of second item in width and 2.0 for 200% (means double) in width. to make it increase or decrease proportionally according to your requirement