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Finding the Fourth Proportional to 71,907.80, 107,910.30 and 40,317.80

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Solution

The fourth proportional to 71,907.80, 107,910.30 and 40,317.80 is: 60,503.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,907.80 : 107,910.30 = 40,317.80 : x
  2. Step 2: Convert to fraction form
    71,907.80/107,910.30 = 40,317.80/x
  3. Step 3: Cross multiply
    71,907.80x = 107,910.30 × 40,317.80
  4. Step 4: Simplify right side
    71,907.80x = 4,350,705,893.34
  5. Step 5: Solve for x
    x = 4,350,705,893.34/71,907.80
  6. Step 6: Final answer
    x = 60,503.95

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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.