Outer planets are more massive and lower density because of its more distance from the sun and accumulation of ice and rock in the core.
The Jovian planets are very massive and formed farther from the Sun where ices and rocks were in huge amount. The cores accumulated rapidly into large clumps of ice and rock due to which they got so large. They captured a large amount of hydrogen and other gasses from the surrounding nebula with their enormous gravity so that's why these planets are filled with large gases.
So we can conclude that outer planets are more massive and lower density because of its more distance from the sun and accumulation of ice and rock in the core.
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