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Finding the Fourth Proportional to 20,610.56, 30,917.04 and 8,129.72

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Solution

The fourth proportional to 20,610.56, 30,917.04 and 8,129.72 is: 12,195.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,610.56 : 30,917.04 = 8,129.72 : x
  2. Step 2: Convert to fraction form
    20,610.56/30,917.04 = 8,129.72/x
  3. Step 3: Cross multiply
    20,610.56x = 30,917.04 × 8,129.72
  4. Step 4: Simplify right side
    20,610.56x = 251,346,878.43
  5. Step 5: Solve for x
    x = 251,346,878.43/20,610.56
  6. Step 6: Final answer
    x = 12,195.05

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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.