$\"\"$

The Pacific Ocean covers about $\"\"$ of Earth.

If $\"\"$ represents the surface area of the Pacific Ocean and $\"\"$ represents the surface area of Earth.

Write an equation:

Surface area of the Pacific Ocean equal $\"\"$ of the surface area of Earth.

$\"\"$ .

$\"\"$ (Substitute $\"\"$ )

Therefore,the equation is $\"\"$ .

$\"\"$

The equation is $\"\"$ .