Short answerModerate3 marks
What number must be added to each of the number 4, 6, 8, 11 in order to get the four numbers in proportion ?
Topic: Ratio and proportion
Previous-year question practice database
Answer
Solution diagram
Exam answer
(4+x)/(6+x)=(8+x)/(11+x). Cross-multiplying gives x²+15x+44=x²+14x+48, so x=4.
Explanation
The result follows by applying the formula or geometric property stated in the working and substituting the given values.
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