1. Find Fourth proportional of `3,7,15`
Solution:
In `a:b :: c:d`, we say that `d` is the fourth proportional to `a,b,c`.
Let the fourth proportional to the numbers `3,7,15` be `x`.
Then, `3:7=15:x`
`:. 3/7=15/x`
`:. x = (7 xx 15)/(3)`
`:. x = 35`
2. Find Fourth proportional of `2,5,6`
Solution:
In `a:b :: c:d`, we say that `d` is the fourth proportional to `a,b,c`.
Let the fourth proportional to the numbers `2,5,6` be `x`.
Then, `2:5=6:x`
`:. 2/5=6/x`
`:. x = (5 xx 6)/(2)`
`:. x = 15`
This material is intended as a summary. Use your textbook for detail explanation.
Any bug, improvement, feedback then
