[O] Format a whole column using ";%.2f" in orgtbl?

[AW]

Hi,

I'm using radiotables and would like to get all numbers of column 1 with two 
digits after the decimal separator. My example below leads to an error, but it 
may explain what I'd like to receive:

Input:

| 100 | Value |
| 150 | Value |
#+TBLFM: $1=%s;%.2f

Desired outoput:

| 100.00 | Value |
| 150.00 | Value |
#+TBLFM: $1=%s;%.2f

I also tried to use :fmt (1 %s;%.2f)
while exporting to LaTeX, but in vain. 

Regards,
Alexander