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Finding the Fourth Proportional to 18,791.76, 28,197.36 and 8,929.20

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Solution

The fourth proportional to 18,791.76, 28,197.36 and 8,929.20 is: 13,398.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.76 : 28,197.36 = 8,929.20 : x
  2. Step 2: Convert to fraction form
    18,791.76/28,197.36 = 8,929.20/x
  3. Step 3: Cross multiply
    18,791.76x = 28,197.36 × 8,929.20
  4. Step 4: Simplify right side
    18,791.76x = 251,779,866.91
  5. Step 5: Solve for x
    x = 251,779,866.91/18,791.76
  6. Step 6: Final answer
    x = 13,398.42

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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.