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Finding the Fourth Proportional to 68,438.33, 102,657.49 and 21,691.21

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Solution

The fourth proportional to 68,438.33, 102,657.49 and 21,691.21 is: 32,536.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,438.33 : 102,657.49 = 21,691.21 : x
  2. Step 2: Convert to fraction form
    68,438.33/102,657.49 = 21,691.21/x
  3. Step 3: Cross multiply
    68,438.33x = 102,657.49 × 21,691.21
  4. Step 4: Simplify right side
    68,438.33x = 2,226,764,660.38
  5. Step 5: Solve for x
    x = 2,226,764,660.38/68,438.33
  6. Step 6: Final answer
    x = 32,536.81

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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.