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Finding the Fourth Proportional to 18,711.31, 28,063.78 and 6,229.92

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Solution

The fourth proportional to 18,711.31, 28,063.78 and 6,229.92 is: 9,343.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.31 : 28,063.78 = 6,229.92 : x
  2. Step 2: Convert to fraction form
    18,711.31/28,063.78 = 6,229.92/x
  3. Step 3: Cross multiply
    18,711.31x = 28,063.78 × 6,229.92
  4. Step 4: Simplify right side
    18,711.31x = 174,835,088.72
  5. Step 5: Solve for x
    x = 174,835,088.72/18,711.31
  6. Step 6: Final answer
    x = 9,343.82

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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.