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Finding the Fourth Proportional to 72,691.72, 108,992.92 and 28,266.68

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Solution

The fourth proportional to 72,691.72, 108,992.92 and 28,266.68 is: 42,382.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,691.72 : 108,992.92 = 28,266.68 : x
  2. Step 2: Convert to fraction form
    72,691.72/108,992.92 = 28,266.68/x
  3. Step 3: Cross multiply
    72,691.72x = 108,992.92 × 28,266.68
  4. Step 4: Simplify right side
    72,691.72x = 3,080,867,991.91
  5. Step 5: Solve for x
    x = 3,080,867,991.91/72,691.72
  6. Step 6: Final answer
    x = 42,382.65

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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.