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Finding the Fourth Proportional to 80,712.80, 121,166.40 and 80,129.60

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Solution

The fourth proportional to 80,712.80, 121,166.40 and 80,129.60 is: 120,290.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,712.80 : 121,166.40 = 80,129.60 : x
  2. Step 2: Convert to fraction form
    80,712.80/121,166.40 = 80,129.60/x
  3. Step 3: Cross multiply
    80,712.80x = 121,166.40 × 80,129.60
  4. Step 4: Simplify right side
    80,712.80x = 9,709,015,165.44
  5. Step 5: Solve for x
    x = 9,709,015,165.44/80,712.80
  6. Step 6: Final answer
    x = 120,290.90

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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.