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Finding the Fourth Proportional to 20,630.16, 28,469.88 and 11,198.88

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Solution

The fourth proportional to 20,630.16, 28,469.88 and 11,198.88 is: 15,454.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,630.16 : 28,469.88 = 11,198.88 : x
  2. Step 2: Convert to fraction form
    20,630.16/28,469.88 = 11,198.88/x
  3. Step 3: Cross multiply
    20,630.16x = 28,469.88 × 11,198.88
  4. Step 4: Simplify right side
    20,630.16x = 318,830,769.73
  5. Step 5: Solve for x
    x = 318,830,769.73/20,630.16
  6. Step 6: Final answer
    x = 15,454.60

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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.