Sum to 30

Is it possible to sum together rational numbers of the form ${ 3 }^{ x }$ with $x$ being rational and ending up with 30 without using 3 itself or the same number more than twice?

${ 3 }^{ 0 }=1\\ { 3 }^{ 1 }=3\\ { 3 }^{ 2 }=9\\ { 3 }^{ 3 }=27\\ { 3 }^{ 4 }=81$