\( \sqrt { 27 : \sqrt { 27 : \sqrt { 27 : \ldots . } } } = ? \)
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To solve the equation \( \sqrt { 27 : \sqrt { 27 : \sqrt { 27 : \ldots } } } \), we start by letting \( x = \sqrt{27 : x} \). Here, the colon ":" denotes division, so we rewrite this as: \[ x = \sqrt{\frac{27}{x}} \] Next, we square both sides to eliminate the square root: \[ x^2 = \frac{27}{x} \] Multiplying both sides by \( x \) (assuming \( x \neq 0 \)) gives us: \[ x^3 = 27 \] Taking the cube root of both sides, we find: \[ x = \sqrt[3]{27} = 3 \] Hence, the solution to the equation is: \[ \boxed{3} \]