whats the area ratio that will give a density ratio of 1.2

Static pressure p=1/1.133=88.3% times stagnation pressure. Density d=1/1.105=90.5% times stagnation density Static Temp. T=1/1.025=97.6% stagnation temperature Flow area A=1.464 times that needed to accelerate the flow to sonic conditions (M=1)