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Finding the Fourth Proportional to 21,267.89, 31,893.56 and 8,789.93

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Solution

The fourth proportional to 21,267.89, 31,893.56 and 8,789.93 is: 13,181.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,267.89 : 31,893.56 = 8,789.93 : x
  2. Step 2: Convert to fraction form
    21,267.89/31,893.56 = 8,789.93/x
  3. Step 3: Cross multiply
    21,267.89x = 31,893.56 × 8,789.93
  4. Step 4: Simplify right side
    21,267.89x = 280,342,115.90
  5. Step 5: Solve for x
    x = 280,342,115.90/21,267.89
  6. Step 6: Final answer
    x = 13,181.47

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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.