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[Boromir is joining them because he and Aragorn are going to Minas Tirith]

[Boromir is joining them because he and Aragorn are going to Minas Tirith]

This isn't explained in-universe, but there are a few contributing factors:

[Ch.] 45. King and Aragorn (with Merry, Legolas, Gimli) ride to the Honrburg. Overtaken by the Sons of Elrond and 30 Rangers seeking Aragorn (probably because of messages sent by Galadriel to Elrond). King rides to Dunharrow by mountain roads. Aragorn (Legolas and Gimli) and Rangers go by open road. Aragorn reveals he has looked in Palantír, and seeks the Paths of the Dead.

Although I haven't found any commentary from Christopher Tolkien confirming it, it's quite possible that Tolkien didn't feel it was worth substantially re-writing the first two-thirds of his manuscript to add in these new characters.

This isn't explained in-universe, but there are a few factors that may have contributed:

[Ch.] 45. King and Aragorn (with Merry, Legolas, Gimli) ride to the Hornburg. Overtaken by the Sons of Elrond and 30 Rangers seeking Aragorn (probably because of messages sent by Galadriel to Elrond). King rides to Dunharrow by mountain roads. Aragorn (Legolas and Gimli) and Rangers go by open road. Aragorn reveals he has looked in Palantír, and seeks the Paths of the Dead.

Even if Tolkien had thought of adding them to the fellowship (which seems unlikely; from a narrative perspective they don't add much), it was probably not worth substantially rewriting two-thirds of his manuscript.

The isn't explained in-universe, but there are a few contributing factors:

This isn't explained in-universe, but there are a few contributing factors: