Of course it's possible, but is it a good idea? I watch the biggest loser and obviously, if you workout 2 or 4 or 6 hours a day, you can lose massive quantities of weight, but I'm not sure if that's realistic or necessary. The key is to get there eventually. If you put that kind of pressure on yourself, you're really not being kind to yourself. Can you imagine telling your friend or spouse that they better lose 10 lbs. a month for the next 4 months or you'll be disappointed with them? Let's say they lose 20 lbs. in the next 4 months instead. You would surely be proud and excited for them. Why not give yourself the same level of love and kindness? You're doing a fantastic job. Also, as far as I've seen on this board, the people who lose weight and really truly keep it off are the ones that made it happen in a way that they can maintain for the rest of their lives...it was a life style change...not a quick fix.
Also, some people CAN lose 40 lbs. in 4 months, but some can do the same thing and weight the same amount and eat the same way and not. We are all different and we don't all fit into the same formulas. As you've probably heard, 3500 calories equals a pound...but for me, it must be untrue because I can burn that amount with my workouts (even if I slash the calories that the machine says I burn in half) and I can also burn that by creating a deficit in the calories I"m consuming, but it just won't be a smooth weight loss. I have bumps and I have frustrations but I just keep moving because the alternative is just not to lose any weight.
At the same time, there are things you can do to make you more efficient. Resistance training is a big one.....but realize that at first, you might not see a drop in weight because your body will likely be retaining some water as it tries to repair itself. Another thing you can do is High Intensity Interval Training. It burns a lot of calories and is super effective. I've read in Oprah magazine that it burns 3 times as much fat as regular training. You can do a google search on it. You could easily add it to your workouts since you're already running. It requires a heart rate monitor though if you want to make sure you're doing it right.
You might also want to watch sodium and eat less processed foods, unless you're doing that already. Sometimes, our bodies are more efficient when they actually recognize what we're eating.
I hope this is helpful.
