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Finding the Fourth Proportional to 68,712.20, 103,125.90 and 31,329.80

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Solution

The fourth proportional to 68,712.20, 103,125.90 and 31,329.80 is: 47,020.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,712.20 : 103,125.90 = 31,329.80 : x
  2. Step 2: Convert to fraction form
    68,712.20/103,125.90 = 31,329.80/x
  3. Step 3: Cross multiply
    68,712.20x = 103,125.90 × 31,329.80
  4. Step 4: Simplify right side
    68,712.20x = 3,230,913,821.82
  5. Step 5: Solve for x
    x = 3,230,913,821.82/68,712.20
  6. Step 6: Final answer
    x = 47,020.96

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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.