Change TikZ Scale for One Path

Question

I would like the orange dot to be a circle. How do I make that happen while keeping otherwise intuitive/straightforward numbers in the code? Or is there no easy way to do that?

This code

\documentclass{article}

\usepackage{amsmath,exsheets,tikz}

\begin{document}

\begin{question}
Put a dot on \(\frac{17}{6}\).

\vspace{0.3cm}
\noindent
\begin{tikzpicture}[xscale=2.5]
\draw (0,0)--(4,0);
\foreach \x in {0,...,24}
 \draw (\x/6,-0.15)--(\x/6,0.15);
\foreach \x in {0,1,...,4}
 \node[below] at (\x,-0.2) {\x};
\fill[orange,xscale=1] (17/6,0) circle (0.1cm);
  %obviously, this xscale adjustment didn't work...
\end{tikzpicture}

\end{question}

\end{document}

Yields this:

Answer 1

Set the yscale to the same as the xscale. Optionally, divide the circle diameter on the same number, i.e.

\fill[orange,yscale=2.5] (17/6,0) circle (0.1cm/2.5);

Another option would be to specify an ellipse, which due to the scaling becomes a circle:

\fill[orange] (17/6,0) circle[x radius=0.1cm/2.5,y radius=0.1cm];

And for good measure, a third workaround:

\fill[orange,xscale=1/2.5] (17/6*2.5,0) circle[radius=0.1cm];

If you don't like repeating the number, you can save it to a macro with e.g. \pgfmathsetmacro{\scalefactor}{2.5}, and use \scalefactor instead of 2.5.