  This paper reports on the extreme ultraviolet (EUV) spectrum of three low
redshift ($z \sim 0.6$) radio loud quasars, 3C 95, 3C 57 and PKS 0405-123. The
spectra were obtained with the Cosmic Origins Spectrograph (COS) of the Hubble
Space Telescope. The bolometric thermal emission, $L_{bol}$, associated with
the accretion flow is a large fraction of the Eddington limit for all of these
sources. We estimate the long term time averaged jet power, $\overline{Q}$, for
the three sources. $\overline{Q}/L_{bol}$, is shown to lie along the
correlation of $\overline{Q}/L_{bol}$ and $\alpha_{EUV}$ found in previous
studies of the EUV continuum of intermediate and high redshift quasars, where
the EUV continuum flux density between 1100 \AA\, and 700 \AA\, is defined by
$F_{\nu} \sim \nu^{-\alpha_{EUV}}$. The high Eddington ratios of the three
quasars extends the analysis into a wider parameter space. Selecting quasars
with high Eddington ratios has accentuated the statistical significance of the
partial correlation analysis of the data. Namely. the correlation of
$\overline{Q}/L_{\mathrm{bol}}$ and $\alpha_{EUV}$ is fundamental and the
correlation of $\overline{Q}$ and $\alpha_{EUV}$ is spurious at a very high
statistical significance level (99.8\%). This supports the regulating role of
ram pressure of the accretion flow in magnetically arrested accretion models of
jet production. In the process of this study, we use multi-frequency and
multi-resolution Very Large Array radio observations to determine that one of
the bipolar jets in 3C 57 is likely frustrated by galactic gas that keeps the
jet from propagating outside the host galaxy.
