The phrase "to balance the proportions" means to make sure that different parts or aspects are equal and well-suited to each other. It is about creating a harmonious or fair combination. Full definition
Major dog food companies make every effort to not only balance ingredients, but also provide the ingredients in usable form to provide balanced proportions of vitamins and minerals for maximum benefit. (puppy-basics.com)
The exterior design is a bit edgy, but it is well executed with balanced proportions, lines, and elements. (burlappcar.com)
Purchase dog food which contains vitamin and mineral supplements in balanced proportions. (petsmagazine.com.sg)