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Finding the Fourth Proportional to 8,387.58, 12,581.28 and 3,455.76

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Solution

The fourth proportional to 8,387.58, 12,581.28 and 3,455.76 is: 5,183.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,387.58 : 12,581.28 = 3,455.76 : x
  2. Step 2: Convert to fraction form
    8,387.58/12,581.28 = 3,455.76/x
  3. Step 3: Cross multiply
    8,387.58x = 12,581.28 × 3,455.76
  4. Step 4: Simplify right side
    8,387.58x = 43,477,884.17
  5. Step 5: Solve for x
    x = 43,477,884.17/8,387.58
  6. Step 6: Final answer
    x = 5,183.60

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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.