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Finding the Fourth Proportional to 68,318.19, 102,480.42 and 20,929.88

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Solution

The fourth proportional to 68,318.19, 102,480.42 and 20,929.88 is: 31,395.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,318.19 : 102,480.42 = 20,929.88 : x
  2. Step 2: Convert to fraction form
    68,318.19/102,480.42 = 20,929.88/x
  3. Step 3: Cross multiply
    68,318.19x = 102,480.42 × 20,929.88
  4. Step 4: Simplify right side
    68,318.19x = 2,144,902,380.55
  5. Step 5: Solve for x
    x = 2,144,902,380.55/68,318.19
  6. Step 6: Final answer
    x = 31,395.77

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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.