Patterson uses a 28t chainring .. and with a 1.6 overdrive = 45t .. the MU360 should already have a 52t .. that said, the Dahon gear inch spec is way off .. from the official site, 32 to 93 g/i or 290% range.. the 360 is 360% range .. so if the bike has 52/18 gears, gear inch would be 27 to 97 on 406x1.75 tires..

If the OP simply wanted taller gearing, then easiest to change the chainring to maybe a 56 or better.. Schlumpf Speeddrive (1.65 overdrive) would work as you an can use a variety of chainrings in 110 BCD.. but that will be somewhat heavy and expensive on an already heavy bike.. if the bike is already geared at 97 g/i I'd probably work on increasing my cadence, as even at 100 rpm, you're doing almost 30mph and that's cooking on a situp bike..