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Finding the Fourth Proportional to 80,512.80, 120,866.40 and 79,929.60

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Solution

The fourth proportional to 80,512.80, 120,866.40 and 79,929.60 is: 119,990.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,512.80 : 120,866.40 = 79,929.60 : x
  2. Step 2: Convert to fraction form
    80,512.80/120,866.40 = 79,929.60/x
  3. Step 3: Cross multiply
    80,512.80x = 120,866.40 × 79,929.60
  4. Step 4: Simplify right side
    80,512.80x = 9,660,803,005.44
  5. Step 5: Solve for x
    x = 9,660,803,005.44/80,512.80
  6. Step 6: Final answer
    x = 119,990.90

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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.