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Finding the Fourth Proportional to 8,765.13, 13,139.90 and 3,217.21

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Solution

The fourth proportional to 8,765.13, 13,139.90 and 3,217.21 is: 4,822.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,765.13 : 13,139.90 = 3,217.21 : x
  2. Step 2: Convert to fraction form
    8,765.13/13,139.90 = 3,217.21/x
  3. Step 3: Cross multiply
    8,765.13x = 13,139.90 × 3,217.21
  4. Step 4: Simplify right side
    8,765.13x = 42,273,817.68
  5. Step 5: Solve for x
    x = 42,273,817.68/8,765.13
  6. Step 6: Final answer
    x = 4,822.95

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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.