Watch the Full Tank online guitar lesson by Brad Carlton from Chord Studies: Evolving Triads Vol. 1
In example 3 you learned how to play a I - IV - V in the 9th position. Here we are almost doing the same thing, the only difference being the substitution of F♯m into where our D used to be. You'll have common tones ringing out between your changes which will help to give you a full sound.