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Finding the Fourth Proportional to 8,687.40, 13,028.70 and 3,139.70

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Solution

The fourth proportional to 8,687.40, 13,028.70 and 3,139.70 is: 4,708.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.40 : 13,028.70 = 3,139.70 : x
  2. Step 2: Convert to fraction form
    8,687.40/13,028.70 = 3,139.70/x
  3. Step 3: Cross multiply
    8,687.40x = 13,028.70 × 3,139.70
  4. Step 4: Simplify right side
    8,687.40x = 40,906,209.39
  5. Step 5: Solve for x
    x = 40,906,209.39/8,687.40
  6. Step 6: Final answer
    x = 4,708.68

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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.