How to pass in a ratio in fractional form?

Question

How to pass in a ratio of 4/15 (instead of its approximated decimal form of 0.266) to table definition.

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Final solution can be seen here.

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Answer 1

If you want more accurate calculations use the fp package.

For example using the fp package as shown below you get 0.999999999999999998 rather than 0.998.

\documentclass[11pt]{article} 
\usepackage{fp}
\begin{document}
  \parindent0pt
  \FPdiv\paramtwo{4}{15}
  \FPdiv\paramthree{2}{15}
  \FPmul\paramtemp{4}{\paramthree}
  \FPdiv\paramseven{3}{15}
  \FPadd\total{\paramseven}{\paramtemp}
  \FPadd\total{\total}{\paramtwo}

  \total
\end{document}

No need for any manual calculations!

You can use it in a tabular as follows (remember it creates variable names on the fly)

\documentclass[11pt]{article} 
\usepackage{fp}

\FPdiv\columni{3.9999999}{3.8888888}
\FPdiv\columnii{1.11123456}{1.3999999}

\begin{document}

\begin{tabular}{|p{\columni cm}|p{\columnii cm}|}
a & b \\
c & d \\
\end{tabular}

\end{document}

Answer 2

I cannot see a gap with a zoom of 400% ...

\documentclass{article}
\parindent=0pt
\textwidth=15cm
\begin{document}

\rule{\textwidth}{5mm}

\rule{0.2667\textwidth}{5mm}%
\rule{0.1333\textwidth}{5mm}%
\rule{0.1333\textwidth}{5mm}%
\rule{0.1333\textwidth}{5mm}%
\rule{0.1333\textwidth}{5mm}%
\rule{0.2\textwidth}{5mm}

\end{document}

Answer 3

See Joseph's solution.