Answer: 121
Explanation:
Hi, to answer this question we have to analyze the information given: 
Since both ratios are equal: 
1331/x = x²/1331 
We simply have to solve for x: 
1331 (1331) =x² (x) 
1,771,561 = x³ 
∛1,771,561 = x 
121 = x 
In conclusion, the value of x is 121 
Feel free to ask for more if needed or if you did not understand something.