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Finding the Fourth Proportional to 71,257.05, 106,891.70 and 18,666.54

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Solution

The fourth proportional to 71,257.05, 106,891.70 and 18,666.54 is: 28,001.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,257.05 : 106,891.70 = 18,666.54 : x
  2. Step 2: Convert to fraction form
    71,257.05/106,891.70 = 18,666.54/x
  3. Step 3: Cross multiply
    71,257.05x = 106,891.70 × 18,666.54
  4. Step 4: Simplify right side
    71,257.05x = 1,995,298,100.39
  5. Step 5: Solve for x
    x = 1,995,298,100.39/71,257.05
  6. Step 6: Final answer
    x = 28,001.41

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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.