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Finding the Fourth Proportional to 20,639.55, 28,482 and 11,687.90

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Solution

The fourth proportional to 20,639.55, 28,482 and 11,687.90 is: 16,128.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.55 : 28,482 = 11,687.90 : x
  2. Step 2: Convert to fraction form
    20,639.55/28,482 = 11,687.90/x
  3. Step 3: Cross multiply
    20,639.55x = 28,482 × 11,687.90
  4. Step 4: Simplify right side
    20,639.55x = 332,894,767.80
  5. Step 5: Solve for x
    x = 332,894,767.80/20,639.55
  6. Step 6: Final answer
    x = 16,128.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.