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Finding the Fourth Proportional to 18,951.27, 28,426.52 and 8,418.43

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Solution

The fourth proportional to 18,951.27, 28,426.52 and 8,418.43 is: 12,627.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,951.27 : 28,426.52 = 8,418.43 : x
  2. Step 2: Convert to fraction form
    18,951.27/28,426.52 = 8,418.43/x
  3. Step 3: Cross multiply
    18,951.27x = 28,426.52 × 8,418.43
  4. Step 4: Simplify right side
    18,951.27x = 239,306,701.67
  5. Step 5: Solve for x
    x = 239,306,701.67/18,951.27
  6. Step 6: Final answer
    x = 12,627.48

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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.