Thread: Quick direct variation problem

The distance to the visible horizon varies directly with the square root of the height
of the observer above sea level. An observer 1.8 m tall can see 4.8 km out to sea when
standing on the shoreline.

I know how to do it but the answers says I'm wrong...

<--- this is meant to be proportional sign but I can't seem to find it and alpha looks close enough xD

so



k=3.57771

we found k then:





but the answer is like 8. something

Part of the question appears to be missing.