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Finding the Fourth Proportional to 72,600.90, 108,873.36 and 28,221.72

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Solution

The fourth proportional to 72,600.90, 108,873.36 and 28,221.72 is: 42,321.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,600.90 : 108,873.36 = 28,221.72 : x
  2. Step 2: Convert to fraction form
    72,600.90/108,873.36 = 28,221.72/x
  3. Step 3: Cross multiply
    72,600.90x = 108,873.36 × 28,221.72
  4. Step 4: Simplify right side
    72,600.90x = 3,072,593,481.38
  5. Step 5: Solve for x
    x = 3,072,593,481.38/72,600.90
  6. Step 6: Final answer
    x = 42,321.70

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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.