Aligning Div Block Heights in a Grid

I have a grid and each cell in the grid has 4 div blocks. The amount of content will vary div block-to-div block but I want to make sure that the vertical height of each div block lines up cell-to-cell in a given row. I do not want to manually fix the height of each div block because that will not create a responsive design. I tried using flexport but it didn’t seem to work. I would appreciate your help.

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