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Finding the Fourth Proportional to 18,978.58, 28,480.17 and 8,590.42

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Solution

The fourth proportional to 18,978.58, 28,480.17 and 8,590.42 is: 12,891.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.58 : 28,480.17 = 8,590.42 : x
  2. Step 2: Convert to fraction form
    18,978.58/28,480.17 = 8,590.42/x
  3. Step 3: Cross multiply
    18,978.58x = 28,480.17 × 8,590.42
  4. Step 4: Simplify right side
    18,978.58x = 244,656,621.97
  5. Step 5: Solve for x
    x = 244,656,621.97/18,978.58
  6. Step 6: Final answer
    x = 12,891.20

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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.