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Finding the Fourth Proportional to 425,499.60, 638,296.11 and 212,321.17

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Solution

The fourth proportional to 425,499.60, 638,296.11 and 212,321.17 is: 318,505.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,499.60 : 638,296.11 = 212,321.17 : x
  2. Step 2: Convert to fraction form
    425,499.60/638,296.11 = 212,321.17/x
  3. Step 3: Cross multiply
    425,499.60x = 638,296.11 × 212,321.17
  4. Step 4: Simplify right side
    425,499.60x = 135,523,777,679.52
  5. Step 5: Solve for x
    x = 135,523,777,679.52/425,499.60
  6. Step 6: Final answer
    x = 318,505.06

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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.