Less Damage Taken? How does it work exactly?

Hi exile! Currently working on a few builds, but I stumbled upon a question:

How does Less Damage Taken stack?

I tried looking for the formula of how it works but I can't find any in the forums or in the wiki. There's this thread: https://www.pathofexile.com/forum/view-thread/2906622/page/1 but they didn't elaborate on how the reduction works on a "numbers" point of view

Does this work like:

Kintsugi: 20% Less
Wind Dancer: 20% Less
Fortify: 20% Less

If the damage taken is 1000, then the equation would be:

1000-[(1000*0.2)+(1000*0.2*0.2)+(1000*0.2*0.2*0.2)]

Then the damage that would pass through (given no other variables) would be

1000-(200+40+8)
1000-248
= 752 Damage goes through

Because I tried the other formula of 1000*0.2*0.2*0.2 and it got a lower number than it should xD

I apologize if this has been asked before and I couldn't find the answer, but thanks in advance if anyone can clarify for me :D !!

If you have 20% less damage taken that means you take 80% damage. And since less damage taken is multiplicative between different sources it would be

1000 x 0,8 x 0,8 x0,8 = 512 damage taken.

"

Baharoth15 wrote:

If you have 20% less damage taken that means you take 80% damage. And since less damage taken is multiplicative between different sources it would be

1000 x 0,8 x 0,8 x0,8 = 512 damage taken.

Ahhh it's 0.8 that I have to multiply to the over-all damage, so something like this:

[ 1000 * (0.8 * 0.8 * 0.8) ] * 100)

Thanks!