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Finding the Fourth Proportional to 278,780.59, 418,196.81 and 79,105.87

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Solution

The fourth proportional to 278,780.59, 418,196.81 and 79,105.87 is: 118,666.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,780.59 : 418,196.81 = 79,105.87 : x
  2. Step 2: Convert to fraction form
    278,780.59/418,196.81 = 79,105.87/x
  3. Step 3: Cross multiply
    278,780.59x = 418,196.81 × 79,105.87
  4. Step 4: Simplify right side
    278,780.59x = 33,081,822,486.27
  5. Step 5: Solve for x
    x = 33,081,822,486.27/278,780.59
  6. Step 6: Final answer
    x = 118,666.16

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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.