The ratio of the diameters of two circles is 3: 5. the circumference of the larger circle is approximately 113.1 m. what is the approximate circumference of the smaller circle? . 7.5 m. 22.6 m. 67.9 m. 188.5 m

The circumference of the circle may be calculated by the equation, C = πD. Thus, the ratio of the diameters is also equal to their circumferences. The ratio and proportion is shown below.
                                   3 / 5 = x / 113.1
Solving for x gives x = 67.89. Therefore,the circumference of the smaller circle is approximately 67.9 m. 

Ralph is earning 2.8% commission