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Finding the Fourth Proportional to 71,921.80, 107,931.30 and 40,331.80

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Solution

The fourth proportional to 71,921.80, 107,931.30 and 40,331.80 is: 60,524.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,921.80 : 107,931.30 = 40,331.80 : x
  2. Step 2: Convert to fraction form
    71,921.80/107,931.30 = 40,331.80/x
  3. Step 3: Cross multiply
    71,921.80x = 107,931.30 × 40,331.80
  4. Step 4: Simplify right side
    71,921.80x = 4,353,063,605.34
  5. Step 5: Solve for x
    x = 4,353,063,605.34/71,921.80
  6. Step 6: Final answer
    x = 60,524.95

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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.