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Finding the Fourth Proportional to 8,455.76, 12,680.28 and 3,388.40

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Solution

The fourth proportional to 8,455.76, 12,680.28 and 3,388.40 is: 5,081.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,455.76 : 12,680.28 = 3,388.40 : x
  2. Step 2: Convert to fraction form
    8,455.76/12,680.28 = 3,388.40/x
  3. Step 3: Cross multiply
    8,455.76x = 12,680.28 × 3,388.40
  4. Step 4: Simplify right side
    8,455.76x = 42,965,860.75
  5. Step 5: Solve for x
    x = 42,965,860.75/8,455.76
  6. Step 6: Final answer
    x = 5,081.25

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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.