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Finding the Fourth Proportional to 72,855.54, 109,289.07 and 20,264.85

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Solution

The fourth proportional to 72,855.54, 109,289.07 and 20,264.85 is: 30,398.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,855.54 : 109,289.07 = 20,264.85 : x
  2. Step 2: Convert to fraction form
    72,855.54/109,289.07 = 20,264.85/x
  3. Step 3: Cross multiply
    72,855.54x = 109,289.07 × 20,264.85
  4. Step 4: Simplify right side
    72,855.54x = 2,214,726,610.19
  5. Step 5: Solve for x
    x = 2,214,726,610.19/72,855.54
  6. Step 6: Final answer
    x = 30,398.88

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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.