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Finding the Fourth Proportional to 278,761.61, 418,158.30 and 79,066.31

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Solution

The fourth proportional to 278,761.61, 418,158.30 and 79,066.31 is: 118,603.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,761.61 : 418,158.30 = 79,066.31 : x
  2. Step 2: Convert to fraction form
    278,761.61/418,158.30 = 79,066.31/x
  3. Step 3: Cross multiply
    278,761.61x = 418,158.30 × 79,066.31
  4. Step 4: Simplify right side
    278,761.61x = 33,062,231,982.58
  5. Step 5: Solve for x
    x = 33,062,231,982.58/278,761.61
  6. Step 6: Final answer
    x = 118,603.96

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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.