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Finding the Fourth Proportional to 13,318.88, 18,387.42 and 8,015

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Solution

The fourth proportional to 13,318.88, 18,387.42 and 8,015 is: 11,065.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,318.88 : 18,387.42 = 8,015 : x
  2. Step 2: Convert to fraction form
    13,318.88/18,387.42 = 8,015/x
  3. Step 3: Cross multiply
    13,318.88x = 18,387.42 × 8,015
  4. Step 4: Simplify right side
    13,318.88x = 147,375,171.30
  5. Step 5: Solve for x
    x = 147,375,171.30/13,318.88
  6. Step 6: Final answer
    x = 11,065.13

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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.