Downsampling by non-integer factor Filter requirement
If the data is already bandlimited to below half the new sample rate, then a low pass filter may not be required.  If not, low pass filtering is required to prevent aliasing, which can corrupt your result.  Low pass filtering can be combined with Sinc kernel interpolation of all the new points needed at the new sample rate, e.g. only one step, no up/down pair of sample computations required.