Home / 20,997.12-31,489.92-7,845.12

Finding the Fourth Proportional to 20,997.12, 31,489.92 and 7,845.12

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Solution

The fourth proportional to 20,997.12, 31,489.92 and 7,845.12 is: 11,765.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,997.12 : 31,489.92 = 7,845.12 : x
  2. Step 2: Convert to fraction form
    20,997.12/31,489.92 = 7,845.12/x
  3. Step 3: Cross multiply
    20,997.12x = 31,489.92 × 7,845.12
  4. Step 4: Simplify right side
    20,997.12x = 247,042,201.19
  5. Step 5: Solve for x
    x = 247,042,201.19/20,997.12
  6. Step 6: Final answer
    x = 11,765.53

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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.