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Finding the Fourth Proportional to 15,060, 20,781.31 and 8,687.17

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Solution

The fourth proportional to 15,060, 20,781.31 and 8,687.17 is: 11,987.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,060 : 20,781.31 = 8,687.17 : x
  2. Step 2: Convert to fraction form
    15,060/20,781.31 = 8,687.17/x
  3. Step 3: Cross multiply
    15,060x = 20,781.31 × 8,687.17
  4. Step 4: Simplify right side
    15,060x = 180,530,772.79
  5. Step 5: Solve for x
    x = 180,530,772.79/15,060
  6. Step 6: Final answer
    x = 11,987.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.