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Finding the Fourth Proportional to 80,672.10, 121,008.15 and 28,044.60

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Solution

The fourth proportional to 80,672.10, 121,008.15 and 28,044.60 is: 42,066.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,672.10 : 121,008.15 = 28,044.60 : x
  2. Step 2: Convert to fraction form
    80,672.10/121,008.15 = 28,044.60/x
  3. Step 3: Cross multiply
    80,672.10x = 121,008.15 × 28,044.60
  4. Step 4: Simplify right side
    80,672.10x = 3,393,625,163.49
  5. Step 5: Solve for x
    x = 3,393,625,163.49/80,672.10
  6. Step 6: Final answer
    x = 42,066.90

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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.