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Finding the Fourth Proportional to 13,770, 20,655 and 5,454.54

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Solution

The fourth proportional to 13,770, 20,655 and 5,454.54 is: 8,181.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,770 : 20,655 = 5,454.54 : x
  2. Step 2: Convert to fraction form
    13,770/20,655 = 5,454.54/x
  3. Step 3: Cross multiply
    13,770x = 20,655 × 5,454.54
  4. Step 4: Simplify right side
    13,770x = 112,663,523.70
  5. Step 5: Solve for x
    x = 112,663,523.70/13,770
  6. Step 6: Final answer
    x = 8,181.81

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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.