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Finding the Fourth Proportional to 20,520.78, 30,781.14 and 6,481.88

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Solution

The fourth proportional to 20,520.78, 30,781.14 and 6,481.88 is: 9,722.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,520.78 : 30,781.14 = 6,481.88 : x
  2. Step 2: Convert to fraction form
    20,520.78/30,781.14 = 6,481.88/x
  3. Step 3: Cross multiply
    20,520.78x = 30,781.14 × 6,481.88
  4. Step 4: Simplify right side
    20,520.78x = 199,519,655.74
  5. Step 5: Solve for x
    x = 199,519,655.74/20,520.78
  6. Step 6: Final answer
    x = 9,722.81

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1.5x scale

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.