The points P, Q, R and S all lie on the same line segment, in that order, such that the ratio of PQ / Q * R / R * S is equal to 1/4 / 1 . If PS = 18 , find QR pls help no links

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.

How is this equation completed? i cannot find any examples in the book.

Anew landowner is interested in constructing a fence around the perimeter of her property. her property is 1,080√30 feet wide and 500√20 feet long. what is the perimeter of the property? (recall that the perimeter is the sum of each side of a shape or boundary). a 1,580√40 feet b. 5,320√5 feet c. 3,160√20 feet d. 10,640√5 feet