You messed up the math by using the formula to convert pale malt to DME. (I got a gentleman's C in college calculus and dropped out of math from that point, so no shame meant in that statement.)
The general rule seems to be that you multiply the LME called for in the recipe by .8 to get the equivalent amount of DME. That would get you the 4.8 Lbs given by Mobrewdude.
I have been brewing lots of recipes out of Graham Wheeler's "Brew Your Own British Real Ale," and uses a different multiplier- .86- as his conversion unit. That would give you 5.16 Lbs.
Either one is going to get you close. If you want to figure out which is closer (please report back if you do), you can plug your proposed converted recipe into Beer Calculus and see what it tells you.
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