So I think I may have figured it out, and for people reading the post here is my attempt at the answer:
[tex]K_{e}=1+\chi_{e}=1+\frac{\epsilon-\epsilon_{0}}{\epsilon_{0}}=1+\frac{\epsilon_{r}\epsilon_{0}-\epsilon_{0}}{\epsilon_{0}}=1+\epsilon_{r}-1=\epsilon_{r}[/tex]
[tex]
\epsilon_{r}=\frac{C_{x}}{C_{0}}[/tex]
So
[tex]
K_{e}=\frac{C_{x}}{C_{0}}[/tex]
where
[tex]K_{e}[/tex] - dielectric constant
[tex]\chi_{e}[/tex] - electric susceptibility
[tex]\epsilon[/tex] - permittivity of the dielectric material
[tex]\epsilon_{r}[/tex] - relative permittivity
[tex]\epsilon_{0}[/tex] - permittivity of free space
[tex]C_{x}[/tex] - capacitance of the dielectric material
[tex]C_{0}[/tex] - capacitance of vacuum
Please feel free to correct me.