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Finding the Fourth Proportional to 71,387.78, 107,087.13 and 18,796.50

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Solution

The fourth proportional to 71,387.78, 107,087.13 and 18,796.50 is: 28,196.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,387.78 : 107,087.13 = 18,796.50 : x
  2. Step 2: Convert to fraction form
    71,387.78/107,087.13 = 18,796.50/x
  3. Step 3: Cross multiply
    71,387.78x = 107,087.13 × 18,796.50
  4. Step 4: Simplify right side
    71,387.78x = 2,012,863,239.05
  5. Step 5: Solve for x
    x = 2,012,863,239.05/71,387.78
  6. Step 6: Final answer
    x = 28,196.19

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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.