The four fingers in part comes down to economics. It’s marginally less costly to include four fingers than five. Also helps the animators as mentioned below. As for the flowers, Twilight may have a point in addition to the aromatic smell lending itself as an aphrodisiac. Or something.

Rarity’s just standing there thinking “Huh, well that’s disappointing.”

@Background Pony #FE68  
interesting…still this explanation is funnier Xd

If anyone is interested the story I heard was that someone (perhaps Walt Disney) figured out that a four-fingered hand didn’t look too weird for audiences to accept and the time saved by the animators drawing one less finger in the thousands of drawings needed for a cartoon was significant.

@Background Pony #2683  
So, why did whoever drew this think otherwise? O__o

@chi  
Well, yeah. Duh.

Ok look…the real reason cartoons only have four fingers is money! yes, in animation it costs more to animate fingers and so to cut back on the cost they limit it to four. Yeah…

@Star Cavalcade  
Yes

How many people put their ring finger next to their dick?

Lol. Spike got no dick!

THAT’S NOT EXACTLY HOW THAT WORKS, PINKIE
 
@Silver Strength  
Fffffft

@YetAnotherBrony  
Y’know, according to Robby London when making the show “Sonic Underground” (not the best show admittedly) when reviewing/approving the show, Sega’s Japanese president was shocked to see Sonic with 4 fingers, and insisted they give him 5. (Odd, sense they let them get away with having 4 in the previous cartoons.)  
The reason being, because of the Yakuza, or Japanese mafia’s trademark of cutting off people’s fingers, so the Sega execs weren’t keen on 4 fingers.
 
So they had to go back, and add a 5th finger to Sonic on all of the previously made animation cells, for nearly half the entire series.
 
According to London, the reason they usually make 4-fingers (or 3-fingers, and a thumb) is because they’re easier to draw/animate. He stated it’s basically an animation trade trick.

@smartz118  
Yes I did.
 
I can do that.

@YetAnotherBrony  
I thought it was because Japan associates the number 4 with death, as they share the same symbol/pronunciation for both words.
 
Also,@PonyPon Did you just reference your own reply?

Now all he has left is flowers.

@PonyPon  
I thought Japan DIDN’T go with the “four-fingered cartoon hands” in their animation because people might think it’s a reference to the Yakuza and one of their practices of cutting off a finger as punishment or payment of debt.

@PonyPon  
No wait, that’s why Japan doesn’t like it.
 
It’s for more simple designs.

@Peachy Keen
 
It’s cartoon logic. Just roll with it.  
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In what part of the world is the ring finger a similar size often enough for that to be a thing?

@Silver Strength  

So which one is right, Twilight or Pinkie?

Ponies call it the Medial Ring Finger.

Pffhaha! Oh Twilight. You remind me so much of myself.  
Minus the being a magical pony anthro girl thing.

They have four fingers because they are gangsta as fuck.