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Finding the Fourth Proportional to 8,517.65, 12,768.98 and 3,319.88

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Solution

The fourth proportional to 8,517.65, 12,768.98 and 3,319.88 is: 4,976.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,517.65 : 12,768.98 = 3,319.88 : x
  2. Step 2: Convert to fraction form
    8,517.65/12,768.98 = 3,319.88/x
  3. Step 3: Cross multiply
    8,517.65x = 12,768.98 × 3,319.88
  4. Step 4: Simplify right side
    8,517.65x = 42,391,400.88
  5. Step 5: Solve for x
    x = 42,391,400.88/8,517.65
  6. Step 6: Final answer
    x = 4,976.89

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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.