How would you figure out a future population?

Question

Let's say the Catholic population in France is 51,600,000 and the Muslim population is 8,400,000, the Muslim population currently grows at 2.3 percent a year, and the Catholic population grows at 0.03 percent per year, how do you find out what percent Catholic the population will be in the year 2100? Or what other information do I need, and how can I calculate it?

Answer 1

You need to know the catholic population in 2100 and the muslim population in 2100.

To calculate the catholic pop:
Pop(c,2100) = Pop(c,now) * (1 + catholic growth rate)^94
Pop(c,2100) = 51,600,000 * (1.0003)^94 = 53,075,607

To calculate the muslim pop:
Pop(m,2100) = Pop(m,now) * (1 + muslim growth rate)^94
Pop(m,2100) = 8,400,000 * (1.0230)^94 = 71,217,849

Catholic pop percentage in 2100:
Pop%cath = Pop(c,2100) / [Total Population]
Pop%cath = Pop(c,2100) / [Pop(c,2100) + Pop (m,2100)]
Pop%cath = 53,075,607 / [53,075,607 + 71,217849]
Pop%cath = 42.7%

Answer 2

P be the current population in 100.
growth rate in percent. =2.3 for Muslims.
dP/dt = 2.3P
dP/P = 2.3dt
log P = 2.3t + C.
Take 2006 as origin.
This means when t = 0, P = 84,000 in hundreds.
Find C.
Find P when t = 94 which will correspond to 2100.
Similarly find the Catholic population.

Answer 3

Since you are going more then 15yrs in the future. You would have to see what new technologies are been implemented and how is that predicted to slow death; increase death. You would need to find out the most sought after job/career. If people are trying to get into entertainment more than let's say medical school, than the knowledge and experience of that society would drop drastically. It is well known and proven that people less informed would die faster. That creates panic and people move

Answer 4

If the Illuminati continue to dominate unchallenged, then their plan is to reduce the worlds population by well over half.
So any population predictions would need to make an assessment of the likelyhood of their plans being carried out.

Answer 5

Depends on the population growth demographics.

Answer 6

http://www.ibiblio.org/lunarbin/worldpop