At a Langrange point: $g_S=g_J$

Therefore:

$\frac{GM_S}{d_S^2}=\frac{GM_J}{d_J^2}$

$\frac{M_S}{d_S^2}=\frac{M_J}{d_J^2}$

$\frac{d_S}{d_J}=\sqrt{\frac{M_S}{M_J}}$

$\frac{d_S}{d_J}=\sqrt{\frac{2.0\times10^{30}}{1.9\times10^{27}}}=32.4$

Fun fact, there is more than one Lagrangian point between two heavy objects in space. The following source (http://hyperphysics.phy-astr.gsu.edu/hbase/Solar/trojan.html) will show you the 5 possible Lagrangian points for Jupiter and the sun. It also discusses that these points are places in space where so-called "Trojan Astroids" will collect. Have a look at this Geogebra simulation (https://www.geogebra.org/m/ezpngc7y#material/hsr7cuhp) as well to explore the positions of different Lagrange points.