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Finding the Fourth Proportional to 278,830.82, 418,245.39 and 79,151.38

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Solution

The fourth proportional to 278,830.82, 418,245.39 and 79,151.38 is: 118,726.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,830.82 : 418,245.39 = 79,151.38 : x
  2. Step 2: Convert to fraction form
    278,830.82/418,245.39 = 79,151.38/x
  3. Step 3: Cross multiply
    278,830.82x = 418,245.39 × 79,151.38
  4. Step 4: Simplify right side
    278,830.82x = 33,104,699,797.14
  5. Step 5: Solve for x
    x = 33,104,699,797.14/278,830.82
  6. Step 6: Final answer
    x = 118,726.83

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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.