Open in App Suggest Corrections 2 | When x is subtracted from each of 19, 28, 55 and 91, the numbers so obtained in this order, are in proportion. What is the mean proportional between (x + 9) and x2? Please scroll down to see the correct answer and solution guide. Right Answer is: CGiven - When x is subtracted from each of 19, 28, 55, 91, obtained numbers are in proportion. Concept used - by componendo and dividendo (a/b) = (x/y) {(a + b)/(a - b)} = {(x + y)/(x - y)} Solution - 19, 28, 55, 91 ⇒ {(19 - x)/(28 - x)} = {(55 - x)/(91 - x) ⇒ By C and D method, ⇒ {(47 - 2x)/(- 9)} = {(146 - 2x)/(- 36)} ⇒ 188 - 8x = 146 - 2x ⇒ 6x = 42 ⇒ x = 7 ⇒ mean proportional = √{7 + 9) × 72} = 28 ∴ mean proportional = 28. Related QuestionsSSC CGL 2021 Skill Test Dates Announced! The Skill Test will be taking place on 4th and 5th January 2023. The SSC CGL Application Status for all Regions and SSC CGL Admit Card for NER, ER, WR, NWR, CR & MPR Regions is active. Candidates can log in to the regional website of SSC and check their application status. SSC CGL 2022 Tier I Prelims Exam will be conducted from 1st to 13th December 2022. The SSC CGL 2022 Notification was out on 17th September 2022. The SSC CGL Eligibility is a bachelor’s degree in the concerned discipline. This year, SSC has completely changed the exam pattern and for the same, the candidates must refer to SSC CGL New Exam Pattern. |