Question:The ratio of third proportional to `12` and `30` and the mean proportional of `9` and `25` is : 

A `2 : 1` 
B `5 : 1` 
C `7 : 15` 
D `9 : 14` 

+ Answer
B 

+ Explanation
Let `12 : 30 = 30 : x`.

Then, `x = (30 xx 30)/12`

` = 75`.

Also, `y = sqrt(9 xx 25)`

` = 15`.

`:.`Required ratio `= x : y`

`= 75 : 15`

`= 5 : 1`.

+ Report

Md. Habib Ullah

Editor, VCampus

Your Name

Your Email

Type of Report
Spelling MistakeIncorrect AnswerGrammar MistakeContent MissingImproper Text FormatInsufficient AnswerDuplicate QuestionImproper Sentence StructureImproper Equation/FormulaOther

Description