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Finding the Fourth Proportional to 278,812.70, 391,125.10 and 278,812.70

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Solution

The fourth proportional to 278,812.70, 391,125.10 and 278,812.70 is: 391,125.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,812.70 : 391,125.10 = 278,812.70 : x
  2. Step 2: Convert to fraction form
    278,812.70/391,125.10 = 278,812.70/x
  3. Step 3: Cross multiply
    278,812.70x = 391,125.10 × 278,812.70
  4. Step 4: Simplify right side
    278,812.70x = 109,050,645,168.77
  5. Step 5: Solve for x
    x = 109,050,645,168.77/278,812.70
  6. Step 6: Final answer
    x = 391,125.10

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.