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Finding the Fourth Proportional to 2,322.56, 3,481.60 and 861.28

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Solution

The fourth proportional to 2,322.56, 3,481.60 and 861.28 is: 1,291.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,322.56 : 3,481.60 = 861.28 : x
  2. Step 2: Convert to fraction form
    2,322.56/3,481.60 = 861.28/x
  3. Step 3: Cross multiply
    2,322.56x = 3,481.60 × 861.28
  4. Step 4: Simplify right side
    2,322.56x = 2,998,632.45
  5. Step 5: Solve for x
    x = 2,998,632.45/2,322.56
  6. Step 6: Final answer
    x = 1,291.09

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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.