Reverse Square Root...

jamestibbets

New Member
Ok I am lamost bald on trying to figure this one out. I have a formula that uses the sqaure root to come up with a number. Here is the formula...

Sqrt(7)*0.845+8.96 the result is 11.20. Now what I need to do is take the answer and back track to the 0.845. Basically I need to be able to use any number like 11.20 and have it come up with the rate. Make sense?

Another way to say it. The base is 8.96 in seven years they get to a mid point of 11.20. So:

sqrt([Years])*([Rate])+[Base]=Midpoint

Years = 7
Rate = 0.845
Base = 8.96
Midpoint = 11.20

When you use the function the rate changes based on the midpoint and base numbers. The base is always 20% less than mid.

I hope this makes sense and someone can help.

Excel Facts

How to create a cell-sized chart?
Tiny charts, called Sparklines, were added to Excel 2010. Look for Sparklines on the Insert tab.

barry houdini

MrExcel MVP
To get the rate

=(Midpoint-Base)/SQRT(Years)

or given that Base is always 20% of Midpoint you can simplify to

=Midpoint/5/SQRT(Years)

Last edited:

Replies
0
Views
1K
Replies
14
Views
529
Replies
0
Views
358
Replies
0
Views
141
Replies
11
Views
1K

1,191,385
Messages
5,986,314
Members
440,017
Latest member
vasanrajeswaran

We've detected that you are using an adblocker.

We have a great community of people providing Excel help here, but the hosting costs are enormous. You can help keep this site running by allowing ads on MrExcel.com.

1)Click on the icon in the browser’s toolbar.
2)Click on the icon in the browser’s toolbar.
2)Click on the "Pause on this site" option.
Go back

1)Click on the icon in the browser’s toolbar.
2)Click on the toggle to disable it for "mrexcel.com".
Go back

Disable uBlock Origin

Follow these easy steps to disable uBlock Origin

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back

Disable uBlock

Follow these easy steps to disable uBlock

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back