For every four points $P_{1},P_{2},P_{3},P_{4}$ on the plane, find the minimum value of $\frac{\sum_{1\le\ i<j\le\ 4}P_{i}P_{j}}{\min_{1\le\ i<j\le\ 4}(P_{i}P_{j})}$.
1. **Normalize the problem**: We are given four points \( P_1, P_2, P_3, P_4 \) in the plane and need to find the minimum value of the expression 
   \[
   \frac{\sum_{1 \le i < j \le 4} P_iP_j}{\min_{1 \le i < j \le 4} P_iP_j}
   \]
   We can normalize the problem by setting the minimum distance between any two points to be 1. This means that 
   \[
   \min_{1 \le i < j \le 4} P_iP_j = 1
   \]
   and we need to minimize the sum of the six distances between the four points.

2. **Consider the geometric configuration**: To minimize the sum of the distances, we need to consider the geometric arrangement of the points. One possible configuration is to place the points at the vertices of a regular tetrahedron. However, since we are working in a plane, we need to consider planar configurations.

3. **Planar configurations**: The simplest planar configuration is to place the points at the vertices of a square. In this case, the distances between adjacent vertices are 1, and the distances between diagonally opposite vertices are \(\sqrt{2}\).

4. **Calculate the distances for a square**: 
   - There are 4 edges of length 1.
   - There are 2 diagonals of length \(\sqrt{2}\).

   Therefore, the sum of the distances is:
   \[
   4 \times 1 + 2 \times \sqrt{2} = 4 + 2\sqrt{2}
   \]

5. **Calculate the expression**: Since the minimum distance is 1, the expression simplifies to:
   \[
   \frac{\sum_{1 \le i < j \le 4} P_iP_j}{\min_{1 \le i < j \le 4} P_iP_j} = 4 + 2\sqrt{2}
   \]

6. **Verify if this is the minimum**: To ensure that this is the minimum value, we need to consider other possible configurations. However, any other configuration that maintains the minimum distance of 1 will have a larger sum of distances due to the triangle inequality and the fact that the square configuration is already quite compact.

Conclusion:
The minimum value of the given expression is \( 4 + 2\sqrt{2} \).

The final answer is \( \boxed{ 4 + 2\sqrt{2} } \)