Half a dozen of the other

From the PM's blog:

"One in four young Australians aged between 16 and 24 have experienced mental health disorders in the previous 12 months, yet only a quarter of young people receive professional help."

Correct me if I'm wrong but isn't one in four, one quarter? So it seems to me that every young person who experiences a mental health disorder receives professional help.

I think they mean that only a quarter of the one in four (one in sixteen if I'm not mistaken) receive professional help but it's not very clear.