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Finding the Fourth Proportional to 18,665.61, 28,001.13 and 6,819.96

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Solution

The fourth proportional to 18,665.61, 28,001.13 and 6,819.96 is: 10,230.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,665.61 : 28,001.13 = 6,819.96 : x
  2. Step 2: Convert to fraction form
    18,665.61/28,001.13 = 6,819.96/x
  3. Step 3: Cross multiply
    18,665.61x = 28,001.13 × 6,819.96
  4. Step 4: Simplify right side
    18,665.61x = 190,966,586.55
  5. Step 5: Solve for x
    x = 190,966,586.55/18,665.61
  6. Step 6: Final answer
    x = 10,230.93

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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.