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Finding the Fourth Proportional to 15,099.31, 20,835.39 and 8,639.02

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Solution

The fourth proportional to 15,099.31, 20,835.39 and 8,639.02 is: 11,920.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,099.31 : 20,835.39 = 8,639.02 : x
  2. Step 2: Convert to fraction form
    15,099.31/20,835.39 = 8,639.02/x
  3. Step 3: Cross multiply
    15,099.31x = 20,835.39 × 8,639.02
  4. Step 4: Simplify right side
    15,099.31x = 179,997,350.92
  5. Step 5: Solve for x
    x = 179,997,350.92/15,099.31
  6. Step 6: Final answer
    x = 11,920.90

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Why These Related Problems?

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