Answer: 1280 m
Explanation:
Let x denotes the length of Golden Gate Bridge .
Given : The length of the Royal Gorge Bridge in Colorado is 320 m.
This is one-fourth the length of the Golden Gate Bridge.
i.e.
[One-fourth=
]
Multiply 4 to the both sides , we get

Hence, the length of the Golden Gate Bridge = 1280 m