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Finding the Fourth Proportional to 18,913.11, 28,387.17 and 9,559.71

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Solution

The fourth proportional to 18,913.11, 28,387.17 and 9,559.71 is: 14,348.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.11 : 28,387.17 = 9,559.71 : x
  2. Step 2: Convert to fraction form
    18,913.11/28,387.17 = 9,559.71/x
  3. Step 3: Cross multiply
    18,913.11x = 28,387.17 × 9,559.71
  4. Step 4: Simplify right side
    18,913.11x = 271,373,112.92
  5. Step 5: Solve for x
    x = 271,373,112.92/18,913.11
  6. Step 6: Final answer
    x = 14,348.41

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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.