Measurement of branching fractions of ${\mathrm{\Lambda }}_c^{+}$ decays to ${\mathrm{\Sigma }}^{+}{K}^{+}{K}^{-}$, ${\mathrm{\Sigma }}^{+}\phi$ and ${\mathrm{\Sigma }}^{+}{K}^{+}{\pi }^{-}({\pi }^0)$

Based on 4.5 fb${}^{-1}$ data taken at seven center-of-mass energies ranging from 4.600 to 4.699 GeV with the BESIII detector at the BEPCII collider, we measure the branching fractions of ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}+hadrons$ relative to ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}{\pi }^{+}{\pi }^{-}$. Combining with the world average branching fraction of ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}{\pi }^{+}{\pi }^{-}$, their branching fractions are measured to be $(0.377\pm 0.042\pm 0.018\pm 0.021)\mathrm{\%}$ for ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}{K}^{+}{K}^{-}$, $(0.200\pm 0.023\pm 0.010\pm 0.011)\mathrm{\%}$ for ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}{K}^{+}{\pi }^{-}$, $(0.414\pm 0.080\pm 0.029\pm 0.023)\mathrm{\%}$ for ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}\phi$ and $(0.197\pm 0.036\pm 0.008\pm 0.011)\mathrm{\%}$ for ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}{K}^{+}{K}^{-}$(non-$\phi$). In all the above results, the first uncertainties are statistical, the second are systematic and the third are from external input of the branching fraction of ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}{\pi }^{+}{\pi }^{-}$. Since no signal for ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^{+}{K}^{+}{\pi }^{-}{\pi }^0$ is observed, the upper limit of its branching fraction is determined to be 0.11% at the 90$\mathrm{\%}$ confidence level.