Need help with a formula through conditional formatting

[DoubleD]

I am self taught in the area of formulas and creating macros, but getting better. However, with no real education in these fields, I sometimes find myself creating more work for what most of you might find elementary... So here is my issue:
I have a percentage in column C and this is formulated based on figures in A and B. Simple math of B/A=C. However, I want to use conditional formatting to highlight the top 3 cells in C, but do not highlight if the figure in A is not greater than 75. Also, if possible, can I highlight these top 3 in different colors?

 

[Chihiro]

You'd need 3 different CFs.

=AND($C1=LARGE(IF($A$1:$A$8>75,$C$1:$C$8),1),$A1>75)

Is the CF formula for highest value in C, when A1>75.

You only need to change the number in red to 2 or 3 for 2nd and 3rd highest value.

See attached.

Edit: Note that this will not differentiate between ties.

 

[DoubleD]

You'd need 3 different CFs.

=AND($C1=LARGE(IF($A$1:$A$8>75,$C$1:$C$8),1),$A1>75)

Is the CF formula for highest value in C, when A1>75.

You only need to change the number in red to 2 or 3 for 2nd and 3rd highest value.

See attached.

Edit: Note that this will not differentiate between ties.

Thank you kindly for your help!!!!