引导数据表——具有相同宽度的行的不同数量的单元格

I have a bootstrap (3.3.7) data table that I want to put the same width on all tds. Eventually, I would like to get all the rows with 3 cells to reach to the right side of the table keeping the same width in each cell. I did tons of research to find something like this but failed so any help with this would much appreciated. I have a bootstrap (3.3.7) data table that I wa