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Finding the Fourth Proportional to 20,800.50, 28,704.88 and 11,847.88

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Solution

The fourth proportional to 20,800.50, 28,704.88 and 11,847.88 is: 16,350.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.50 : 28,704.88 = 11,847.88 : x
  2. Step 2: Convert to fraction form
    20,800.50/28,704.88 = 11,847.88/x
  3. Step 3: Cross multiply
    20,800.50x = 28,704.88 × 11,847.88
  4. Step 4: Simplify right side
    20,800.50x = 340,091,973.65
  5. Step 5: Solve for x
    x = 340,091,973.65/20,800.50
  6. Step 6: Final answer
    x = 16,350.18

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1.5x scale

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.