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Finding the Fourth Proportional to 13,606.98, 20,400.81 and 5,279.97

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Solution

The fourth proportional to 13,606.98, 20,400.81 and 5,279.97 is: 7,916.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,606.98 : 20,400.81 = 5,279.97 : x
  2. Step 2: Convert to fraction form
    13,606.98/20,400.81 = 5,279.97/x
  3. Step 3: Cross multiply
    13,606.98x = 20,400.81 × 5,279.97
  4. Step 4: Simplify right side
    13,606.98x = 107,715,664.78
  5. Step 5: Solve for x
    x = 107,715,664.78/13,606.98
  6. Step 6: Final answer
    x = 7,916.21

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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.