Difference formula

[BrettRust]

I require a formula that recognises the difference between two numbers.
Eg in cell a1 we have 1.5. in cell a2 we have 2.7. in cell a3 i want the value 1.2
displayed.
I require the difference formula as the value in cell a2 will be greater in some instances than the value in cell a1 so a simple subtraction sum is not sufficient.

Thanks in advance for your assistance

 

[jasonb75]

if you wish to adjust the %, use jasonb75's formula but set a reference instead of the 67%:

=A1+((A2-A1)*B1)

With 67% in B1, you could then modify the percentage in B1 to fit our needs.
You could also use a data validation to select from 33,50,67.

2    67%        3.34
4

That method would work with fractions as well

Sheet2

<TABLE style="BACKGROUND-COLOR: #ffffff; PADDING-LEFT: 2pt; PADDING-RIGHT: 2pt; FONT-FAMILY: Calibri,Arial; FONT-SIZE: 11pt" border=1 cellSpacing=0 cellPadding=0><COLGROUP><COL style="WIDTH: 30px; FONT-WEIGHT: bold"><COL style="WIDTH: 64px"><COL style="WIDTH: 65px"></COLGROUP><TBODY><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt; FONT-WEIGHT: bold"><TD> </TD><TD>A</TD><TD>B</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">1</TD><TD style="TEXT-ALIGN: right">7</TD><TD style="TEXT-ALIGN: right">2/3</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">2</TD><TD style="TEXT-ALIGN: right">4</TD><TD style="TEXT-ALIGN: right">5 </TD></TR></TBODY></TABLE>
<TABLE style="BORDER-BOTTOM-STYLE: groove; BORDER-BOTTOM-COLOR: #00ff00; BORDER-RIGHT-STYLE: groove; BACKGROUND-COLOR: #fffcf9; BORDER-TOP-COLOR: #00ff00; FONT-FAMILY: Arial; BORDER-TOP-STYLE: groove; COLOR: #000000; BORDER-RIGHT-COLOR: #00ff00; FONT-SIZE: 10pt; BORDER-LEFT-STYLE: groove; BORDER-LEFT-COLOR: #00ff00"><TBODY><TR><TD>Spreadsheet Formulas</TD></TR><TR><TD><TABLE style="FONT-FAMILY: Arial; FONT-SIZE: 9pt" border=1 cellSpacing=0 cellPadding=2><TBODY><TR style="BACKGROUND-COLOR: #cacaca; FONT-SIZE: 10pt"><TD>Cell</TD><TD>Formula</TD></TR><TR><TD>B2</TD><TD>=A1+(A2-A1)*B1</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
B1 needs to be formatted as fraction before the value is entered or excel will think 2/3 is a date and give some obscure results.