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Finding the Fourth Proportional to 667,872.62, 921,763.13 and 422,880.15

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Solution

The fourth proportional to 667,872.62, 921,763.13 and 422,880.15 is: 583,637.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,872.62 : 921,763.13 = 422,880.15 : x
  2. Step 2: Convert to fraction form
    667,872.62/921,763.13 = 422,880.15/x
  3. Step 3: Cross multiply
    667,872.62x = 921,763.13 × 422,880.15
  4. Step 4: Simplify right side
    667,872.62x = 389,795,328,723.39
  5. Step 5: Solve for x
    x = 389,795,328,723.39/667,872.62
  6. Step 6: Final answer
    x = 583,637.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.