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Finding the Fourth Proportional to 8,765.72, 13,144.20 and 2,920.28

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Solution

The fourth proportional to 8,765.72, 13,144.20 and 2,920.28 is: 4,378.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,765.72 : 13,144.20 = 2,920.28 : x
  2. Step 2: Convert to fraction form
    8,765.72/13,144.20 = 2,920.28/x
  3. Step 3: Cross multiply
    8,765.72x = 13,144.20 × 2,920.28
  4. Step 4: Simplify right side
    8,765.72x = 38,384,744.38
  5. Step 5: Solve for x
    x = 38,384,744.38/8,765.72
  6. Step 6: Final answer
    x = 4,378.96

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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.