x / 17 = 12/51

To solve the equation \( \frac{x}{17} = \frac{12}{51} \), you can start by cross-multiplying:

\[ x \cdot 51 = 12 \cdot 17 \]

Now calculate \( 12 \cdot 17 \):

\[ 12 \cdot 17 = 204 \]

So the equation becomes:

\[ 51x = 204 \]

Now, divide both sides by 51 to solve for \( x \):

\[ x = \frac{204}{51} \]

Now simplify \( \frac{204}{51} \):

\[ 204 \div 51 = 4 \]

Thus,

\[ x = 4 \]

The solution is:

\[ x = 4 \]