Dont solve by putting values earlier solve by taking variables form a general eqn the put values it will save time make question easy with less chances of error.see this soln
FA1/FA2={(DA2)/(DA1)}^2,
FA1=FA2×{(DA2)/(DA1)}^2,
So, FA1=4×10^5×(1.5/2)^2,
i.e. FA1=2.5×10^5