This is a puzzle cache with some very easy maths- I even tell you how to solve it! How’s that for generosity?
Here is what you must do.
Express the ratio as a decimal number to 6 decimal places.
Subtract the first 3 numbers after the decimal point from the given south coordinate.
Add the last 3 numbers to the given east coordinate..
That was easy, wasn't it? Now you should be able to go out there and find the cache.
Just in case you might have goofed. you can check your answer.