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Finding the Fourth Proportional to 71,371.70, 107,057.55 and 68,091.20

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Solution

The fourth proportional to 71,371.70, 107,057.55 and 68,091.20 is: 102,136.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,371.70 : 107,057.55 = 68,091.20 : x
  2. Step 2: Convert to fraction form
    71,371.70/107,057.55 = 68,091.20/x
  3. Step 3: Cross multiply
    71,371.70x = 107,057.55 × 68,091.20
  4. Step 4: Simplify right side
    71,371.70x = 7,289,677,048.56
  5. Step 5: Solve for x
    x = 7,289,677,048.56/71,371.70
  6. Step 6: Final answer
    x = 102,136.80

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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.