The result of your conversion between cawney and perch appears here
To convert between Cawney and Perch you have to do the following:
First divide (4/3) * (0.09290304*43560) / 25.29285264 = 213.33333333
Then multiply the amount of Cawney you want to convert to Perch, use the chart below to guide you.
Symbol: cawney
No description
Symbol: perch
No description