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Finding the Fourth Proportional to 279,115.20, 418,672.80 and 139,147.20

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Solution

The fourth proportional to 279,115.20, 418,672.80 and 139,147.20 is: 208,720.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,115.20 : 418,672.80 = 139,147.20 : x
  2. Step 2: Convert to fraction form
    279,115.20/418,672.80 = 139,147.20/x
  3. Step 3: Cross multiply
    279,115.20x = 418,672.80 × 139,147.20
  4. Step 4: Simplify right side
    279,115.20x = 58,257,147,836.16
  5. Step 5: Solve for x
    x = 58,257,147,836.16/279,115.20
  6. Step 6: Final answer
    x = 208,720.80

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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.