The figure gives experimentally measured B vs H variation in ferromagnetic material. 
The ratio of saturation magnetization to retentivity is

 

 

x = retentivity (induced magnetic field at zero applied field); y = coercivity (resistance to demagnetization); 

z = saturation magnetization (point at which curve tends to become horizontal)
$r=\frac{z}{x}=\frac{3}{2}=1.5$.