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Finding the Fourth Proportional to 103,720.40, 155,321.40 and 68,469.20

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Solution

The fourth proportional to 103,720.40, 155,321.40 and 68,469.20 is: 102,532.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,720.40 : 155,321.40 = 68,469.20 : x
  2. Step 2: Convert to fraction form
    103,720.40/155,321.40 = 68,469.20/x
  3. Step 3: Cross multiply
    103,720.40x = 155,321.40 × 68,469.20
  4. Step 4: Simplify right side
    103,720.40x = 10,634,732,000.88
  5. Step 5: Solve for x
    x = 10,634,732,000.88/103,720.40
  6. Step 6: Final answer
    x = 102,532.69

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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.