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Finding the Fourth Proportional to 522,099.80, 781,983.30 and 428,787.80

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Solution

The fourth proportional to 522,099.80, 781,983.30 and 428,787.80 is: 642,223.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    522,099.80 : 781,983.30 = 428,787.80 : x
  2. Step 2: Convert to fraction form
    522,099.80/781,983.30 = 428,787.80/x
  3. Step 3: Cross multiply
    522,099.80x = 781,983.30 × 428,787.80
  4. Step 4: Simplify right side
    522,099.80x = 335,304,898,843.74
  5. Step 5: Solve for x
    x = 335,304,898,843.74/522,099.80
  6. Step 6: Final answer
    x = 642,223.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.