How to Batch process a .jpg into multiple image sizes and colour modes

Hi,

I am needing to find an action or script that when run on a batch of Jpgs will open them up run a few actions and save them as 4 different files as follows

start file:
image.jpg

end result:
image_RGB_300dpi.jpg
image_RGB_72dpi.jpg
image_CMYK_300dpi.jpg
image_CMYK_72dpi.jpg

At present I have 4 separate actions set up do do this so I am running the batch process 4 times to get this result, is it possible to combine multiple actions into a single batch process?

thanks for any help on this one.