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Finding the Fourth Proportional to 18,790.65, 28,189.22 and 6,311.88

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Solution

The fourth proportional to 18,790.65, 28,189.22 and 6,311.88 is: 9,468.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,790.65 : 28,189.22 = 6,311.88 : x
  2. Step 2: Convert to fraction form
    18,790.65/28,189.22 = 6,311.88/x
  3. Step 3: Cross multiply
    18,790.65x = 28,189.22 × 6,311.88
  4. Step 4: Simplify right side
    18,790.65x = 177,926,801.43
  5. Step 5: Solve for x
    x = 177,926,801.43/18,790.65
  6. Step 6: Final answer
    x = 9,468.90

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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.