Leadership

Mathematics

Eight Standard

Test your understanding of this lesson Ratio and Proportion | Proportion:-

1)
The third proportional to \((x+y)^2\) and \(x^2-y^2\) is
  • \(x^2+y^2\)
  • \(x^2-y^2\)
  • x-y
  • \((x-y)^2\)
2)
The fourth proportional to \(p^3+q^3,p^2-pq+q^2\), and p+q is
  • p-q
  • \(p^2-q^2\)
  • 1
  • -1
3)
If b is the mean proportional to a and c then \(abc(a+b+c)^3\) is equals to
  • \((a+b+c)^2\)
  • abc
  • \((ab+bc+ca)^3\)
  • \((ab+bc+ca)^2\)
4)
If two numbers are such that the mean proportional between them is 15 and third proportional to them is 120,then the numbers are
  • 15, 7.5
  • 30,7.5
  • 24,7.5
  • 8,12
5)
The mean proportional between \(\frac{a}{b}+\frac{b}{a}+2\) and \(\frac{1}{ab}\) is
  • \(\frac{ab}{a+b}\)
  • \(\frac{a+b}{ab}\)
  • a+b
  • 1
Hand draw

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