Setup font size of different types to be the same

Question

For mathematical documents i like using the fourier package with the upright option, however the symbols \mathcal produces are quite too quirky in my opinion, so I replaced them with the default font via \DeclareMathAlphabet{\mathcal}{OMS}{cmsy}{m}{n} - however these symbols have a different font size than the fourier fonts.

Here is an example which shows that the caligraphic X is too big:

How can I reduce the size of \mathcal symbols?

Answer 1

You can load the cmsy font scaled at .942 (computed by comparing the heights):

\documentclass{article}
\usepackage{fourier}
\DeclareFontFamily{OMS}{fcmsy}{\skewchar\font48 }
\DeclareFontShape{OMS}{fcmsy}{m}{n}{%
         <-5.5> [.942] cmsy5     <5.5-6.5> [.942] cmsy6
      <6.5-7.5> [.942] cmsy7     <7.5-8.5> [.942] cmsy8
      <8.5-9.5> [.942] cmsy9     <9.5->  [.942] cmsy10
      }{}
\DeclareFontShape{OMS}{fcmsy}{b}{n}{%
       <-6> [.942] cmbsy5
      <6-8> [.942] cmbsy7
      <8->  [.942] cmbsy10
      }{}
\DeclareMathAlphabet{\mathcal}{OMS}{fcmsy}{m}{n}
\begin{document}
$X\mathcal{X}$
\end{document}