Repeating pattern of empty lines
Pip, 26 12 bytes
T0{LbPaLcPx}

-14 bytes after taking ratio as two arguments.
Explanation:
T0           Till 0 (infinite loop)
  {Lb        Loop b(second argument) number of times
     Pa      Print a(first argument) with newline
       Lc    Loop c(third argument) number of times
         Px} Print x(empty string) with newline

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