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Finding the Fourth Proportional to 278,772.60, 418,174.78 and 79,077.36

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Solution

The fourth proportional to 278,772.60, 418,174.78 and 79,077.36 is: 118,620.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,772.60 : 418,174.78 = 79,077.36 : x
  2. Step 2: Convert to fraction form
    278,772.60/418,174.78 = 79,077.36/x
  3. Step 3: Cross multiply
    278,772.60x = 418,174.78 × 79,077.36
  4. Step 4: Simplify right side
    278,772.60x = 33,068,157,620.98
  5. Step 5: Solve for x
    x = 33,068,157,620.98/278,772.60
  6. Step 6: Final answer
    x = 118,620.54

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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.