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Finding the Fourth Proportional to 80,480.40, 120,720.60 and 36,108.60

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Solution

The fourth proportional to 80,480.40, 120,720.60 and 36,108.60 is: 54,162.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,480.40 : 120,720.60 = 36,108.60 : x
  2. Step 2: Convert to fraction form
    80,480.40/120,720.60 = 36,108.60/x
  3. Step 3: Cross multiply
    80,480.40x = 120,720.60 × 36,108.60
  4. Step 4: Simplify right side
    80,480.40x = 4,359,051,857.16
  5. Step 5: Solve for x
    x = 4,359,051,857.16/80,480.40
  6. Step 6: Final answer
    x = 54,162.90

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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.