\version "2.18.0"

\score {
  
<<
  { c'4 s2. c'4 s2. c'8 s2.. c'16 s2... }
  { R1*4 }
>>
\layout {
    \context {
      \Score
      proportionalNotationDuration = #(ly:make-moment 1/4)
    }
  }
}