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Finding the Fourth Proportional to 18,917.27, 28,373.91 and 8,387.47

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Solution

The fourth proportional to 18,917.27, 28,373.91 and 8,387.47 is: 12,580.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.27 : 28,373.91 = 8,387.47 : x
  2. Step 2: Convert to fraction form
    18,917.27/28,373.91 = 8,387.47/x
  3. Step 3: Cross multiply
    18,917.27x = 28,373.91 × 8,387.47
  4. Step 4: Simplify right side
    18,917.27x = 237,985,318.91
  5. Step 5: Solve for x
    x = 237,985,318.91/18,917.27
  6. Step 6: Final answer
    x = 12,580.32

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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.