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Finding the Fourth Proportional to 12,635.90, 18,917.13 and 7,354.79

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Solution

The fourth proportional to 12,635.90, 18,917.13 and 7,354.79 is: 11,010.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,635.90 : 18,917.13 = 7,354.79 : x
  2. Step 2: Convert to fraction form
    12,635.90/18,917.13 = 7,354.79/x
  3. Step 3: Cross multiply
    12,635.90x = 18,917.13 × 7,354.79
  4. Step 4: Simplify right side
    12,635.90x = 139,131,423.97
  5. Step 5: Solve for x
    x = 139,131,423.97/12,635.90
  6. Step 6: Final answer
    x = 11,010.81

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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.