As a divinatory line, nine at the fourth place of The Marrying Maiden reads within the hexagram's overall concern with action taken now will be evil, in no way advantageous. The line occupies a place that does not match its own nature in the classical doctrine that odd places favour a firm, yang line and even places favour a yielding, yin line. Its own text, that the time protracted, married later than expected, but the time will come, is the particular fortune assigned to this one stage of the situation, not to the hexagram as a whole.
The fourth line corresponds by classical convention with the first line, and the two do not correspond here, since both lines share the same character. Read together with the trigram it belongs to, Zhen in the upper position of the figure, the line marks the first word of the upper trigram, close enough to the ruling fifth line to be shaped by it, one stage in the six stage movement the hexagram traces from its first line to its last.
A change at this line, from yang to its opposite, is the mechanism the tradition uses to move from one hexagram to another. Flipping the fourth line of The Marrying Maiden turns Zhen into Kun while the other trigram, Dui, stays as it is, which yields The Marrying Maiden's changing partner, Approach (King Wen 19), the hexagram this line is recorded as transforming into.