Timmy needs to go 40 mph at the start to make it all the way to the top of the ramp.
He measures his speed on three trial runs and goes 36, x, and 38 mph.
To find his average speed, we can calculate the sum of his speeds and divide by the number of trials: (36 + x + 38) / 3.
He needs to go faster than his average speed, so the difference between his target speed of 40 mph and his average speed is: 40 - [(36 + x + 38) / 3].
We are given that the difference is 4 mph, so we can write: 40 - [(36 + x + 38) / 3] = 4.
Simplifying the equation, we get: (36 + x + 38) / 3 = 36.
Multiplying both sides by 3, we get: 36 + x + 38 = 108.
Subtracting 36 and 38 from both sides, we get: x = 34.
The value of x is 34.
#### 34
The answer is: 34
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Timmy plans to ride a skateboard ramp that is 50 feet high. He knows he needs to go 40 mph at the start to make it all the way to the top. He measures his speed on three trial runs and goes 36, x, and 38 mph. How much faster does he have to go than his average speed to make it up the ramp?
If we know the answer to the above question is 4, what is the value of unknown variable x?

### Answer:
