Answer
3, 4
Work Step by Step
Let x be one natural number. x+1 is the other.
Hence, $\frac{1}{x} - \frac{1}{x+1} = \frac{1}{4}*\frac{1}{x}$
Multiply by x(x+1) on both sides
(x+1) - x = (x+1)/4
x+1 = 4
x=3
x+1=4
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