Here is the breakdown of damage combustion does by components:

Combustion: 7374 tick - [100%]
----
Ignite: 9704.8/2 = 4852.4 [65.8%]
Living Bomb: 5612/3 = 1870.6 [25.35%]
Pyroblast! dot: 1953/3 = 651 [8.8%]
смотри и вникай, не благодари