Compare Fractions: Determine the Correct Symbol Between 1/9 and 3/27

To determine the missing sign between $\frac{1}{9}$ and $\frac{3}{27}$, we will first simplify the fraction $\frac{3}{27}$.

Step 1: Simplify $\frac{3}{27}$.
The greatest common divisor (GCD) of 3 and 27 is 3. So, we divide both the numerator and the denominator by 3:

$\frac{3 \div 3}{27 \div 3} = \frac{1}{9}$

Step 2: Compare $\frac{1}{9}$ and the simplified version of $\frac{3}{27}$, which is $\frac{1}{9}$.

Since both fractions are equal, we fill in the missing sign with an equals sign.

Therefore, the correct answer is $=$.