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Can someone help me here with my math ???

So what's going on here am I thinking crazy or are these numbers crazy and not anywhere near correct??? 

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You might have something like 450 being 12% but 45000 being 95%
There is a proper formula AFAIK but I don't know what it is
However, it is a little odd that the percentages directly add up.
Raw stat: actual percentage
500: 20%
1000: 33%
2000: 50%
…
8000: 80%
2637: 3%
346: 15%
876539:16%
42: 20%
So I don't know about you but this sure doesn't seem to be reasonable or understandable at all
You have a base block proficiency of 3670, which translates to 64.7% reduced damage while blocking. The stat focus adds 1093 block proficiency. Your new stat total is now 4763, which translates to 70.4%, a 5.7% increase. This is all correct information that has been conveyed to you.
That would mean 64.7% = 12,406 . I really hope you can comprehend this !
I can’t think of a champ example off the top of my head, but for certain champs you will see in their description something like “when X happens, attack increases by Y amount.” Sometimes those numbers seem huge — you might have a base attack of 4000 that gets increased by 2x or 3x or 5x. But when the fight is happening and you get the increase, it’s not like your champ starts hitting 3x harder with 3x bigger numbers. Yeah, there is a noticeable increase but it’s not an insane change. That’s diminishing returns in action.
*not a mathematician, I’m sure others can do a better job explaining
So yes, you're correct that without the hidden formula, it's not really math because we're just operating blindly and speculatively about the precise % increases.
There’s an actual diminishing returns formula: StatValue = Stat / (Stat + 5 x CR + 1500), where CR is the challenge rating of the opponent (not the champion, what they are fighting at the moment). It’s crude, I would have done something different, but it encapsulates the basic idea that stats affected by DR have a dynamic range of 0.0 through 1.0 (sometimes described as zero to one hundred percent) and the incremental effect of increasing the stat diminishes as the stat approaches 1.0.
There’s a number of reasons for doing this, it makes logical sense for stats whose effects are expressed as percentages or chance, and it roughly encapsulates the proportional effect if stats that have inverse beneficial effects. In fact if you calculate survivability in terms of flat stat resistances the effect of the DR formula results in a roughly linear survivability curve. This is something done deliberately in other games.
Level 200 and level 1 are not 200 times difference between them