Home / 20,620.55-30,909.56-8,123.68

Finding the Fourth Proportional to 20,620.55, 30,909.56 and 8,123.68

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Solution

The fourth proportional to 20,620.55, 30,909.56 and 8,123.68 is: 12,177.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.55 : 30,909.56 = 8,123.68 : x
  2. Step 2: Convert to fraction form
    20,620.55/30,909.56 = 8,123.68/x
  3. Step 3: Cross multiply
    20,620.55x = 30,909.56 × 8,123.68
  4. Step 4: Simplify right side
    20,620.55x = 251,099,179.21
  5. Step 5: Solve for x
    x = 251,099,179.21/20,620.55
  6. Step 6: Final answer
    x = 12,177.13

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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.