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Finding the Fourth Proportional to 13,608.92, 20,410.95 and 8,663.87

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Solution

The fourth proportional to 13,608.92, 20,410.95 and 8,663.87 is: 12,994.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,608.92 : 20,410.95 = 8,663.87 : x
  2. Step 2: Convert to fraction form
    13,608.92/20,410.95 = 8,663.87/x
  3. Step 3: Cross multiply
    13,608.92x = 20,410.95 × 8,663.87
  4. Step 4: Simplify right side
    13,608.92x = 176,837,817.38
  5. Step 5: Solve for x
    x = 176,837,817.38/13,608.92
  6. Step 6: Final answer
    x = 12,994.26

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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.