A four bar mechanism is shown in the figure. The link numbers are mentioned near the links. Input link 2 is rotating anti-clockwise with a constant angular speed ω₂. Length of different links are :

The magnitude of the angular speed of the output link 4 is ω₄ at the instant when link 2 makes an angle of 90^o with O₂O₄ as shown. The ratio  is __________ (round off to two decimal places).