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Finding the Fourth Proportional to 80,737.40, 121,106.10 and 77,108.60

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Solution

The fourth proportional to 80,737.40, 121,106.10 and 77,108.60 is: 115,662.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,737.40 : 121,106.10 = 77,108.60 : x
  2. Step 2: Convert to fraction form
    80,737.40/121,106.10 = 77,108.60/x
  3. Step 3: Cross multiply
    80,737.40x = 121,106.10 × 77,108.60
  4. Step 4: Simplify right side
    80,737.40x = 9,338,321,822.46
  5. Step 5: Solve for x
    x = 9,338,321,822.46/80,737.40
  6. Step 6: Final answer
    x = 115,662.90

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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.