Convert Hex to IEEE-754 float

Hello
I need to convert a Hex value in floatting point 32bits can I use ruby for that? if yes, how?
Any other suggestions?
Thanks for your help

For those who are looking how to do that here is the way working for me :

event.set( '[ln_resistance]', [event.get('[ln_resistance_B_inversion]')].pack('H*').unpack('g').first )

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