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Finding the Fourth Proportional to 68,711.40, 103,071.18 and 21,330.96

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Solution

The fourth proportional to 68,711.40, 103,071.18 and 21,330.96 is: 31,997.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,711.40 : 103,071.18 = 21,330.96 : x
  2. Step 2: Convert to fraction form
    68,711.40/103,071.18 = 21,330.96/x
  3. Step 3: Cross multiply
    68,711.40x = 103,071.18 × 21,330.96
  4. Step 4: Simplify right side
    68,711.40x = 2,198,607,217.73
  5. Step 5: Solve for x
    x = 2,198,607,217.73/68,711.40
  6. Step 6: Final answer
    x = 31,997.71

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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.