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Finding the Fourth Proportional to 21,108, 29,129.52 and 13,668.96

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Solution

The fourth proportional to 21,108, 29,129.52 and 13,668.96 is: 18,863.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108 : 29,129.52 = 13,668.96 : x
  2. Step 2: Convert to fraction form
    21,108/29,129.52 = 13,668.96/x
  3. Step 3: Cross multiply
    21,108x = 29,129.52 × 13,668.96
  4. Step 4: Simplify right side
    21,108x = 398,170,243.70
  5. Step 5: Solve for x
    x = 398,170,243.70/21,108
  6. Step 6: Final answer
    x = 18,863.48

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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.