![When ‘ a’ is subtract from each of 21, 38, 55, and 106, then the numbers obtained in this order](https://www.gkseries.com/blog/wp-content/uploads/2024/04/When-‘-a-is-subtract-from-each-of-21-38-55-and-106-then-the-numbers-obtained-in-this-order.jpg)
When ‘ a’ is subtract from each of 21, 38, 55, and 106, then the numbers obtained in this order, are in proportion. What is the mean proportional between (8+a) and (a-1)?
a) 7
b) 6
c) 8
d) 4
Sol:
![](https://www.gkseries.com/blog/wp-content/uploads/2024/04/image-114-630x1024.png)
When ‘ a’ is subtract from each of 21, 38, 55, and 106, then the numbers obtained in this order, are in proportion. What is the mean proportional between (8+a) and (a-1)?
a) 7
b) 6
c) 8
d) 4
Sol:
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