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Finding the Fourth Proportional to 425,865.80, 638,389.10 and 331,043.40

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Solution

The fourth proportional to 425,865.80, 638,389.10 and 331,043.40 is: 496,246.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,865.80 : 638,389.10 = 331,043.40 : x
  2. Step 2: Convert to fraction form
    425,865.80/638,389.10 = 331,043.40/x
  3. Step 3: Cross multiply
    425,865.80x = 638,389.10 × 331,043.40
  4. Step 4: Simplify right side
    425,865.80x = 211,334,498,186.94
  5. Step 5: Solve for x
    x = 211,334,498,186.94/425,865.80
  6. Step 6: Final answer
    x = 496,246.70

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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.