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Finding the Fourth Proportional to 425,634.40, 638,127.60 and 215,423.20

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Solution

The fourth proportional to 425,634.40, 638,127.60 and 215,423.20 is: 322,970.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,634.40 : 638,127.60 = 215,423.20 : x
  2. Step 2: Convert to fraction form
    425,634.40/638,127.60 = 215,423.20/x
  3. Step 3: Cross multiply
    425,634.40x = 638,127.60 × 215,423.20
  4. Step 4: Simplify right side
    425,634.40x = 137,467,489,600.32
  5. Step 5: Solve for x
    x = 137,467,489,600.32/425,634.40
  6. Step 6: Final answer
    x = 322,970.82

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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.