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Finding the Fourth Proportional to 425,734.60, 638,601.90 and 391,328.20

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Solution

The fourth proportional to 425,734.60, 638,601.90 and 391,328.20 is: 586,992.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,734.60 : 638,601.90 = 391,328.20 : x
  2. Step 2: Convert to fraction form
    425,734.60/638,601.90 = 391,328.20/x
  3. Step 3: Cross multiply
    425,734.60x = 638,601.90 × 391,328.20
  4. Step 4: Simplify right side
    425,734.60x = 249,902,932,043.58
  5. Step 5: Solve for x
    x = 249,902,932,043.58/425,734.60
  6. Step 6: Final answer
    x = 586,992.30

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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.