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Finding the Fourth Proportional to 20,626.56, 30,918.56 and 8,129.68

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Solution

The fourth proportional to 20,626.56, 30,918.56 and 8,129.68 is: 12,186.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,626.56 : 30,918.56 = 8,129.68 : x
  2. Step 2: Convert to fraction form
    20,626.56/30,918.56 = 8,129.68/x
  3. Step 3: Cross multiply
    20,626.56x = 30,918.56 × 8,129.68
  4. Step 4: Simplify right side
    20,626.56x = 251,357,998.86
  5. Step 5: Solve for x
    x = 251,357,998.86/20,626.56
  6. Step 6: Final answer
    x = 12,186.13

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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.