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Finding the Fourth Proportional to 68,521.01, 102,780.38 and 20,489.72

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Solution

The fourth proportional to 68,521.01, 102,780.38 and 20,489.72 is: 30,734.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,521.01 : 102,780.38 = 20,489.72 : x
  2. Step 2: Convert to fraction form
    68,521.01/102,780.38 = 20,489.72/x
  3. Step 3: Cross multiply
    68,521.01x = 102,780.38 × 20,489.72
  4. Step 4: Simplify right side
    68,521.01x = 2,105,940,745.02
  5. Step 5: Solve for x
    x = 2,105,940,745.02/68,521.01
  6. Step 6: Final answer
    x = 30,734.24

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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.