I bought a 24" Western Flyer some time ago for the chrome wheels and a couple of other things. It came with a 46 tooth front sprocket and a 20 tooth rear sprocket for a 2.3 ratio. This coupled with 24 x 1.75 tires makes for an easy riding bike for a child.
You've yet to tell us how many teeth are on the chain ring. If there are more than 46 teeth, I'll give you the 46 tooth chain ring if you're willing to pay the shipping. I'll see if I can get the 20 tooth cog off the rear hub if you think that you'd want to go that far. My chain ring looks exactly like the one on your bike. The closer in number the teeth are together on each gog, the easier the bike will be to ride (like one to one.) Just don't expect to go very fast without rapid leg action.