To model values, one must have a fairly good knowledge of mathematical relations. Model equations predict values of the experiment in untested situations. Many occupations require the use of mathematics. All the scientific uses above apply in the scientific fields of the real world. Speaking of proportion, architects use mathematics in many ways.
Conic sections are quite popular with architects, along with other geometric figures.
Not only do they have to make everything pleasing to the eye, they must calculate the weight distribution and make sure that the structure will not fall. The construction workers must be able to understand the measurements and specifications for their work. Accountants and bankers must meticulously use tons and tons of arithmetic and certain functions to do their everyday jobs. Different computer programmers all tend to deal with different branches of mathematics. This is only a brief sampling of all the work out there requiring mathematics.