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Finding the Fourth Proportional to 9,321.05, 12,863.05 and 5,129.30

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Solution

The fourth proportional to 9,321.05, 12,863.05 and 5,129.30 is: 7,078.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,321.05 : 12,863.05 = 5,129.30 : x
  2. Step 2: Convert to fraction form
    9,321.05/12,863.05 = 5,129.30/x
  3. Step 3: Cross multiply
    9,321.05x = 12,863.05 × 5,129.30
  4. Step 4: Simplify right side
    9,321.05x = 65,978,365.23
  5. Step 5: Solve for x
    x = 65,978,365.23/9,321.05
  6. Step 6: Final answer
    x = 7,078.43

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.