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Finding the Fourth Proportional to 8,658.96, 12,991.52 and 2,815.58

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Solution

The fourth proportional to 8,658.96, 12,991.52 and 2,815.58 is: 4,224.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.96 : 12,991.52 = 2,815.58 : x
  2. Step 2: Convert to fraction form
    8,658.96/12,991.52 = 2,815.58/x
  3. Step 3: Cross multiply
    8,658.96x = 12,991.52 × 2,815.58
  4. Step 4: Simplify right side
    8,658.96x = 36,578,663.88
  5. Step 5: Solve for x
    x = 36,578,663.88/8,658.96
  6. Step 6: Final answer
    x = 4,224.37

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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.