Which one will replace the question mark ?

Concept: In a number-based analogy grid, each row follows its own multiplicative relationship — the third and fourth entries are obtained by multiplying the row's first two entries by a row-specific factor (Column 3 = Column 1 × k, Column 4 = Column 2 × k). This factor k can differ between rows and must be found independently for each row from its two known entries.

1. Row 1: 7 × 3 = 21 and 9 × 3 = 27, so the multiplier for row 1 is 3.

2. Row 2: 4 × 9 = 36 and 2 × 9 = 18, so the multiplier for row 2 is 9.

3. Row 3: the known pair is 9 and 54; 54 ÷ 9 = 6, so the multiplier for row 3 is 6.

4. Applying this multiplier to row 3's second known entry: 4 × 6 = 24.

Cross-check: 9 × 6 = 54 matches the grid, and 4 × 6 = 24 uses that same row-specific multiplier on both columns, confirming the pattern holds consistently.

Therefore, the missing value is 24.