Measurement of the branching fractions of ${\Lambda }_c^{+}\to p\overline{K}n\left(\pi \right)$

Using data recorded by the CLEO-II detector at CESR, we report new measurements of the branching fractions for the decays of the charmed baryon ${\Lambda }_c^{+}$ into ${\mathrm{pK}}^{-}{\pi }^{+}{\pi }^0,$ $p{K}^0,$ $p{K}^0{\pi }^{+}{\pi }^{-},$ and $p{K}^0{\pi }^0,$ all measured relative to ${\mathrm{pK}}^{-}{\pi }^{+}.$ The relative branching fractions are $0.67\pm 0.04\pm 0.11,0.46\pm 0.02\pm 0.04,0.52\pm 0.04\pm 0.05,$ and $0.66\pm 0.05\pm 0.07,$ respectively.