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Finding the Fourth Proportional to 18,951, 28,404.36 and 11,165.28

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Solution

The fourth proportional to 18,951, 28,404.36 and 11,165.28 is: 16,734.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,951 : 28,404.36 = 11,165.28 : x
  2. Step 2: Convert to fraction form
    18,951/28,404.36 = 11,165.28/x
  3. Step 3: Cross multiply
    18,951x = 28,404.36 × 11,165.28
  4. Step 4: Simplify right side
    18,951x = 317,142,632.62
  5. Step 5: Solve for x
    x = 317,142,632.62/18,951
  6. Step 6: Final answer
    x = 16,734.88

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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.