Actual distance between earth and sun: 1 AU
Supposed distance: 4 AU
Given that the gravitational force is inverse to the square of the distance that separate the masses, this would be weaker if the distance is greater.
Here you hava a mathematical demonstration:
Gravitational force α 1/r^2 (α is used to indicate proportionality)
Actual Force / [1 /(1AU)^2] = New Force / [1 / (4AU)^2]
=> New Force = [1 / 16 AU^2 ] * Actual Force / [1 / 1 AU^2]
New Force = Actual Force / 16
Then, the new force would be weaker; exactly it would be one sixteenth of the actual force.
