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Finding the Fourth Proportional to 20,479.62, 30,670.20 and 11,687.88

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Solution

The fourth proportional to 20,479.62, 30,670.20 and 11,687.88 is: 17,503.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.62 : 30,670.20 = 11,687.88 : x
  2. Step 2: Convert to fraction form
    20,479.62/30,670.20 = 11,687.88/x
  3. Step 3: Cross multiply
    20,479.62x = 30,670.20 × 11,687.88
  4. Step 4: Simplify right side
    20,479.62x = 358,469,617.18
  5. Step 5: Solve for x
    x = 358,469,617.18/20,479.62
  6. Step 6: Final answer
    x = 17,503.72

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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.