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Finding the Fourth Proportional to 80,820.40, 121,230.60 and 72,072.40

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Solution

The fourth proportional to 80,820.40, 121,230.60 and 72,072.40 is: 108,108.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,820.40 : 121,230.60 = 72,072.40 : x
  2. Step 2: Convert to fraction form
    80,820.40/121,230.60 = 72,072.40/x
  3. Step 3: Cross multiply
    80,820.40x = 121,230.60 × 72,072.40
  4. Step 4: Simplify right side
    80,820.40x = 8,737,380,295.44
  5. Step 5: Solve for x
    x = 8,737,380,295.44/80,820.40
  6. Step 6: Final answer
    x = 108,108.60

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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.