To solve the optimization problem described, we will use the Gurobi Python interface. The goal is to minimize the objective function `3.51 * hours_worked_by_Jean + 7.43 * hours_worked_by_Ringo` subject to several constraints involving organization score, likelihood to quit index, work quality rating, and specific linear combinations of the variables.

The problem involves two decision variables: `hours_worked_by_Jean` and `hours_worked_by_Ringo`. Both are allowed to be fractional. The constraints can be summarized as follows:

1. Organization score constraints:
   - Minimum combined organization score: `6 * hours_worked_by_Jean + 21 * hours_worked_by_Ringo >= 44`
   - Maximum combined organization score: `6 * hours_worked_by_Jean + 21 * hours_worked_by_Ringo <= 113`

2. Likelihood to quit index constraints:
   - Minimum combined likelihood to quit index: `13 * hours_worked_by_Jean + 10 * hours_worked_by_Ringo >= 46`
   - Maximum combined likelihood to quit index: `13 * hours_worked_by_Jean + 10 * hours_worked_by_Ringo <= 126`

3. Work quality rating constraints:
   - Minimum combined work quality rating: `9 * hours_worked_by_Jean + 8 * hours_worked_by_Ringo >= 16`
   - Maximum combined work quality rating: `9 * hours_worked_by_Jean + 8 * hours_worked_by_Ringo <= 65`

4. Additional linear constraint:
   - `3 * hours_worked_by_Jean - 4 * hours_worked_by_Ringo >= 0`

Given these constraints and the objective function, we can formulate the problem in Gurobi as follows:

```python
from gurobipy import *

# Create a new model
m = Model("Optimization_Problem")

# Define the decision variables
hours_worked_by_Jean = m.addVar(vtype=GRB.CONTINUOUS, name="hours_worked_by_Jean")
hours_worked_by_Ringo = m.addVar(vtype=GRB.CONTINUOUS, name="hours_worked_by_Ringo")

# Set the objective function
m.setObjective(3.51 * hours_worked_by_Jean + 7.43 * hours_worked_by_Ringo, GRB.MINIMIZE)

# Add constraints
m.addConstr(6 * hours_worked_by_Jean + 21 * hours_worked_by_Ringo >= 44, name="min_organization_score")
m.addConstr(6 * hours_worked_by_Jean + 21 * hours_worked_by_Ringo <= 113, name="max_organization_score")

m.addConstr(13 * hours_worked_by_Jean + 10 * hours_worked_by_Ringo >= 46, name="min_likelihood_to_quit")
m.addConstr(13 * hours_worked_by_Jean + 10 * hours_worked_by_Ringo <= 126, name="max_likelihood_to_quit")

m.addConstr(9 * hours_worked_by_Jean + 8 * hours_worked_by_Ringo >= 16, name="min_work_quality_rating")
m.addConstr(9 * hours_worked_by_Jean + 8 * hours_worked_by_Ringo <= 65, name="max_work_quality_rating")

m.addConstr(3 * hours_worked_by_Jean - 4 * hours_worked_by_Ringo >= 0, name="additional_linear_constraint")

# Optimize the model
m.optimize()

# Print the results
if m.status == GRB.OPTIMAL:
    print("Optimal solution found.")
    print(f"Hours worked by Jean: {hours_worked_by_Jean.x}")
    print(f"Hours worked by Ringo: {hours_worked_by_Ringo.x}")
    print(f"Objective function value: {m.objVal}")
else:
    print("No optimal solution found.")
```