X:380=400

To solve the equation \( X:380 = 400 \), you would multiply both sides by 380 to isolate \( X \).

Starting with the equation:

\[ X:380 = 400 \]

This can be rewritten as:

\[ \frac{X}{380} = 400 \]

Now, multiply both sides by 380:

\[ X = 400 \times 380 \]

Calculating the right side:

\[ X = 152000 \]

Thus, the solution is:

\[ X = 152000 \]