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Finding the Fourth Proportional to 8,717.31, 12,042.15 and 7,929.99

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Solution

The fourth proportional to 8,717.31, 12,042.15 and 7,929.99 is: 10,954.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,717.31 : 12,042.15 = 7,929.99 : x
  2. Step 2: Convert to fraction form
    8,717.31/12,042.15 = 7,929.99/x
  3. Step 3: Cross multiply
    8,717.31x = 12,042.15 × 7,929.99
  4. Step 4: Simplify right side
    8,717.31x = 95,494,129.08
  5. Step 5: Solve for x
    x = 95,494,129.08/8,717.31
  6. Step 6: Final answer
    x = 10,954.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.