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When x is subtracted from each of 19, 28...

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 proportion between (x + 9) and `x^2`? जब x को 19, 28, 55 और 91 में से घटाया जाता है, तो इस क्रम में प्राप्त संख्याएँ अनुपात में होती हैं। (x + 9) और `x^2` के बीच माध्य अनुपात क्या है?

A

28

B

24

C

32

D

27

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