I solved my problem by specifying the column range
 #+tblfm: @2$4..@-2$4 = ($3 / $2) * 100


On Sun, Dec 17, 2017 at 11:53 PM, Eric S Fraga <esflists@gmail.com> wrote:

> On Saturday, 16 Dec 2017 at 19:24, Qiang Fang wrote:
> > The last column is the ratio between column b and a, the last row is
> > the sum of each row, the second formula only applies from the second
> > row to the row before last row. The table that doesn't work is:
> >
> >     |     |      a |     b |      ratio |
> >     |     |  0.797 | 0.780 |            |
> >     |     |  0.744 | 0.730 |            |
> >     |     | 12.707 | 2.384 |            |
> >     | sum | 14.248 | 3.114 | 0.92040988 |
> >     | ^   |      x |     y |            |
> >     #+tblfm: $x=vsum(@2..@-1) :: $y=vsum(@3..@-1)
> >     #+tblfm: $4 = ($3 / $2) * 100
>
> I cannot help with the OP's question but this table leads to very
> strange behaviour for me.  If I delete the tblfm lines, then go to the
> location of the x variable (5th row, 2nd column) and type C-u C-c = to
> enter "x=vsum(@2..@i-1)", that is okay.  But if I then go to the next
> column and try to enter the equivalent formula for y, it replaces the
> previously entered formula for x!  If I go back to the x location and
> re-enter that formula, it replaces the y formula.
>
> Further, the formulae created by org are missing the $ in front of the
> variable, i.e. x=vsum(...) instead of $x=vsum(...).
>
> This happens with up to date org from git as of an hour or so ago.
>
> For the OP, the formulas
>
> --
> Eric S Fraga via Emacs 27.0.50, Org release_9.1.4-214-ge8b71b
>