To find the value of \( x \) in the sequence of angles provided, we can use the fact that the sum of angles in a complete circle is \( 360° \).
Given the angles:
- \( 40° \)
- \( x \)
- \( 273° \)
We can set up the equation:
\[ 40° + x + 273° = 360° \]
Now, combine the known angles:
\[ 40° + 273° = 313° \]
Now, substitute this back into the equation:
\[ 313° + x = 360° \]
To find \( x \), subtract \( 313° \) from \( 360° \):
\[ x = 360° - 313° = 47° \]
Thus, the value of \( x \) is:
\[ \boxed{47°} \]