Try moving your triad up the scale as a block chord, just using the white notes of C major. Be sure to maintain the full triad shape. You’ll hear the associated chords of F major, G major and A minor.
For example, in the scale of C major, the chords are numbered like this ... A perfect cadence in the key of C major ends by moving from V (G major) to I (C major) Listen to this example of ...