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Finding the Fourth Proportional to 80,428.80, 120,740.40 and 79,845.60

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Solution

The fourth proportional to 80,428.80, 120,740.40 and 79,845.60 is: 119,864.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,428.80 : 120,740.40 = 79,845.60 : x
  2. Step 2: Convert to fraction form
    80,428.80/120,740.40 = 79,845.60/x
  3. Step 3: Cross multiply
    80,428.80x = 120,740.40 × 79,845.60
  4. Step 4: Simplify right side
    80,428.80x = 9,640,589,682.24
  5. Step 5: Solve for x
    x = 9,640,589,682.24/80,428.80
  6. Step 6: Final answer
    x = 119,864.90

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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.