>just say the sender is sending 100 pulses
>i require this to send out <so many pulses> in the same time span. i
believe you all understand what i mean


inherently, any solution is going to have some jitter in it, or have some
lag,
but you just want to change the instantaneous average rate.

what you need is a reverted loop

    n = (256 * number pulses needed) / (per number in)
    accum = 0
    npulse = n / 256;
    n = n % 256;

    for(;;)
    {
        waitforinputpulse();
        for (i = 0 ; i < npulse ; i++)
            output pulse;
        accum += n;
        if (accum >= 256)
        {
            accum -= 256;
            output pulse;
        }
    }

You may be able to eliminate the for(i=... loop and only
test the 0 and 1 conditions if your ratio never exceeds 2.