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Finding the Fourth Proportional to 71,379.92, 106,915.71 and 67,187.61

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Solution

The fourth proportional to 71,379.92, 106,915.71 and 67,187.61 is: 100,636.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,379.92 : 106,915.71 = 67,187.61 : x
  2. Step 2: Convert to fraction form
    71,379.92/106,915.71 = 67,187.61/x
  3. Step 3: Cross multiply
    71,379.92x = 106,915.71 × 67,187.61
  4. Step 4: Simplify right side
    71,379.92x = 7,183,411,026.35
  5. Step 5: Solve for x
    x = 7,183,411,026.35/71,379.92
  6. Step 6: Final answer
    x = 100,636.31

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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.