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Finding the Fourth Proportional to 80,672.40, 120,979.80 and 28,083.60

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Solution

The fourth proportional to 80,672.40, 120,979.80 and 28,083.60 is: 42,115.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,672.40 : 120,979.80 = 28,083.60 : x
  2. Step 2: Convert to fraction form
    80,672.40/120,979.80 = 28,083.60/x
  3. Step 3: Cross multiply
    80,672.40x = 120,979.80 × 28,083.60
  4. Step 4: Simplify right side
    80,672.40x = 3,397,548,311.28
  5. Step 5: Solve for x
    x = 3,397,548,311.28/80,672.40
  6. Step 6: Final answer
    x = 42,115.37

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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.