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Finding the Fourth Proportional to 68,310.67, 102,472.83 and 20,925.21

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Solution

The fourth proportional to 68,310.67, 102,472.83 and 20,925.21 is: 31,389.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,310.67 : 102,472.83 = 20,925.21 : x
  2. Step 2: Convert to fraction form
    68,310.67/102,472.83 = 20,925.21/x
  3. Step 3: Cross multiply
    68,310.67x = 102,472.83 × 20,925.21
  4. Step 4: Simplify right side
    68,310.67x = 2,144,265,487.04
  5. Step 5: Solve for x
    x = 2,144,265,487.04/68,310.67
  6. Step 6: Final answer
    x = 31,389.91

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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.