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Finding the Fourth Proportional to 103,481.40, 155,222.10 and 71,988.60

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Solution

The fourth proportional to 103,481.40, 155,222.10 and 71,988.60 is: 107,982.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,481.40 : 155,222.10 = 71,988.60 : x
  2. Step 2: Convert to fraction form
    103,481.40/155,222.10 = 71,988.60/x
  3. Step 3: Cross multiply
    103,481.40x = 155,222.10 × 71,988.60
  4. Step 4: Simplify right side
    103,481.40x = 11,174,221,668.06
  5. Step 5: Solve for x
    x = 11,174,221,668.06/103,481.40
  6. Step 6: Final answer
    x = 107,982.90

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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.