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Finding the Fourth Proportional to 68,019.78, 102,029.90 and 20,635.26

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Solution

The fourth proportional to 68,019.78, 102,029.90 and 20,635.26 is: 30,952.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,019.78 : 102,029.90 = 20,635.26 : x
  2. Step 2: Convert to fraction form
    68,019.78/102,029.90 = 20,635.26/x
  3. Step 3: Cross multiply
    68,019.78x = 102,029.90 × 20,635.26
  4. Step 4: Simplify right side
    68,019.78x = 2,105,413,514.27
  5. Step 5: Solve for x
    x = 2,105,413,514.27/68,019.78
  6. Step 6: Final answer
    x = 30,952.96

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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.