Ratio between Sum of Columns is not logical

Hi.
I have an excel table with three Columns. Each cell in column 3 is a multiplier of constant between 3.57 and 3.78 and the first column. The constants are in the second column.
i.e. col1 * col2= col 3
this is the table:

Col1 ____ Col2 ____ Col3
-2027.47 ____ 3.75 ____ -7594.77
-3095.82 ____ 3.74 ____ -11582.71
-528.97 ____ 3.78 ____ -2001.17
-559.33 ____ 3.78 ____ -2114.5
-579.34 ____ 3.70 ____ -2142.5
-1017.48 ____ 3.70 ____ -3762
-1025.66 ____ 3.70 ____ -3790
-2023.24 ____ 3.71 ____ -7498.37
641.74 ____ 3.69 ____ 2371
919.03 ____ 3.60 ____ 3305.79
-11042 ____ 3.73 ____ -41160.98
-5890.66 ____ 3.73 ____ -21999.76
-2275.86 ____ 3.74 ____ -8509.4
-8537.12 ____ 3.73 ____ -31883.45
-6639.5 ____ 3.73 ____ -24796.45
-10248.6 ____ 3.73 ____ -38221.73
-5000.81 ____ 3.71 ____ -18576.77
-5020.84 ____ 3.71 ____ -18651.18
-1617.82 ____ 3.73 ____ -6039.96
5796.17 ____ 3.59 ____ 20788.78
10483.96 ____ 3.59 ____ 37602.16
917.89 ____ 3.57 ____ 3272.66
7420.43 ____ 3.59 ____ 26614.4
11283.23 ____ 3.59 ____ 40468.85
-748.56 ____ 3.70 ____ -2767.6
-40.05 ____ 3.70 ____ -148
-10029.42 ____ 3.70____ -37107
4954.66 ____ 3.58 ____ 17735.51
2894.89 ____ 3.70 ____ 10707
2011.03 ____ 3.57 ____ 7187.1
4117.92 ____ 3.57 ____ 14716.46
8387.64 ____ 3.57 ____ 29978.81

-18119.96 ____ 4.17 ____ -75599.78

The last row contains the sum of Col1 and Col3. But when I calculate the ratio between the 2 sums it is 4.17!!!!
How can it be when the max ratio between each column cell is a max of 3.78??
Please help
Thanks in advance.