The missing height value in feet for 330 days is 918 feet. Calculated using the given ratio of yards to feet (9 yards: 27 feet) and applied to the known height in yards (306).
To find the missing value for the height in feet when the days are 330:
Use the given ratio of yards to feet for the known values:
.
Apply the same ratio to the unknown value:
![\[ 306 \, \text{yards} : x \, \text{feet} \]](https://img.qammunity.org/2021/formulas/mathematics/college/14rq5dpvyvcnhq541ap9ljas09xpawtf68.png)
Set up a proportion to solve for x:
![\[ (9)/(27) = (306)/(x) \]](https://img.qammunity.org/2021/formulas/mathematics/college/e48kuzz6j6k0xvmz783ie48vgpzebuveao.png)
Cross-multiply:
![\[ 9x = 27 * 306 \]](https://img.qammunity.org/2021/formulas/mathematics/college/5436qkgv4a09lg6y0aio510504mjo5z354.png)
Solve for x:
![\[ x = (27 * 306)/(9) \]](https://img.qammunity.org/2021/formulas/mathematics/college/b1l964otk67z4r36gaza5q7wqd5wer7ipv.png)
x = 918
Therefore, the missing value for the height in feet when the days are 330 is 918 feet.