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Finding the Fourth Proportional to 8,939.10, 13,404.60 and 3,390.60

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Solution

The fourth proportional to 8,939.10, 13,404.60 and 3,390.60 is: 5,084.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,939.10 : 13,404.60 = 3,390.60 : x
  2. Step 2: Convert to fraction form
    8,939.10/13,404.60 = 3,390.60/x
  3. Step 3: Cross multiply
    8,939.10x = 13,404.60 × 3,390.60
  4. Step 4: Simplify right side
    8,939.10x = 45,449,636.76
  5. Step 5: Solve for x
    x = 45,449,636.76/8,939.10
  6. Step 6: Final answer
    x = 5,084.36

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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.