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Finding the Fourth Proportional to 8,620.56, 12,931.92 and 3,355.68

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Solution

The fourth proportional to 8,620.56, 12,931.92 and 3,355.68 is: 5,033.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620.56 : 12,931.92 = 3,355.68 : x
  2. Step 2: Convert to fraction form
    8,620.56/12,931.92 = 3,355.68/x
  3. Step 3: Cross multiply
    8,620.56x = 12,931.92 × 3,355.68
  4. Step 4: Simplify right side
    8,620.56x = 43,395,385.31
  5. Step 5: Solve for x
    x = 43,395,385.31/8,620.56
  6. Step 6: Final answer
    x = 5,033.94

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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.