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Finding the Fourth Proportional to 8,624.75, 12,936.78 and 2,781.54

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Solution

The fourth proportional to 8,624.75, 12,936.78 and 2,781.54 is: 4,172.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,624.75 : 12,936.78 = 2,781.54 : x
  2. Step 2: Convert to fraction form
    8,624.75/12,936.78 = 2,781.54/x
  3. Step 3: Cross multiply
    8,624.75x = 12,936.78 × 2,781.54
  4. Step 4: Simplify right side
    8,624.75x = 35,984,171.04
  5. Step 5: Solve for x
    x = 35,984,171.04/8,624.75
  6. Step 6: Final answer
    x = 4,172.20

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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.