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Finding the Fourth Proportional to 78,891.76, 118,267.30 and 28,960.39

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Solution

The fourth proportional to 78,891.76, 118,267.30 and 28,960.39 is: 43,414.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,891.76 : 118,267.30 = 28,960.39 : x
  2. Step 2: Convert to fraction form
    78,891.76/118,267.30 = 28,960.39/x
  3. Step 3: Cross multiply
    78,891.76x = 118,267.30 × 28,960.39
  4. Step 4: Simplify right side
    78,891.76x = 3,425,067,132.25
  5. Step 5: Solve for x
    x = 3,425,067,132.25/78,891.76
  6. Step 6: Final answer
    x = 43,414.76

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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.