You can't increase ram with internal memory... Just because the ram it's fastest memory, active applications uses it, and active applications needs fast memory so you'll only decrease performance instead of what you want!
The scheme is like CPU operates with RAM (that it's faster), when you open an app it will be loaded in ram, so the CPU can work with it.
Sorry for the english i don't know how to explain better
Phone: Sony Xperia Z
ROM: MIUI V5 BASED ON STOCK FIRMWARE (4.2.2)
KERNEL: XzKernel v11
+SanDisk 32GB Class 10+