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Finding the Fourth Proportional to 8,579.70, 12,851.33 and 7,121.70

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Solution

The fourth proportional to 8,579.70, 12,851.33 and 7,121.70 is: 10,667.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,579.70 : 12,851.33 = 7,121.70 : x
  2. Step 2: Convert to fraction form
    8,579.70/12,851.33 = 7,121.70/x
  3. Step 3: Cross multiply
    8,579.70x = 12,851.33 × 7,121.70
  4. Step 4: Simplify right side
    8,579.70x = 91,523,281.25
  5. Step 5: Solve for x
    x = 91,523,281.25/8,579.70
  6. Step 6: Final answer
    x = 10,667.42

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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.