At $2,600 on average for an MRI and $1,100 on average for an ultrasound, even one unnecessary test is too many for folks on a budget, unless your insurance or Medicare covers the test.or example, the cost of a CT scanner can be as low as $65,000 for a refurbished one that produces only small images quickly. A larger and brand new CT scanner can run as high as $2.5 million. Prices are slightly higher for MRI machines, running up to about $3 million for a new machine.
1. constant of proportionality-the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality. factor of proportionality.
Variable y is directly proportional to the variable x. In mathematics, two variables are proportional if a change in one is always accompanied by a change in the other, and if the changes are always related by use of a constant multiplier. The constant is called the coefficient of proportionality or proportionality constant. 1  If one variable is always the product of the other and a constant, the two are said to be directly proportional. x and y are directly proportional if the ratio yx is constant.