$\"\"$

The word $\"\"$ 12 is to 18 $\"\"$ represents the expression $\"\"$ .

The word $\"\"$ as $\"\"$ means equal and its symbol $\"\"$ .

The word $\"\"$ d is to 27 $\"\"$ represents the expression $\"\"$ .

The word $\"\"$ 12 is to 18 as d is to 27 $\"\"$ represents the proportion $\"\"$ . $\"\"$

The proportion is $\"\"$ .

Multiply each side by 27.

$\"\"$

Cancel common terms.

$\"\"$

$\"\"$ . $\"\"$

The value of $\"\"$ .