like if a make a rectangle, i want its one side to be twice of other. then if i make a circle, how to make its radius one fourth or rectangles smaller side.

and then when i need to change dimensions, i could just change the dimension of smallest side of rectangle to change dimension of everything.of '

yes i am aware of 'equal to' constraint, but is there a way to do what i am asking for?
like for designing a nut and bolt, all the dimensions are related to the dia of the bolt. so it would be easy to give everything with respect to dia