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Finding the Fourth Proportional to 20,630.34, 28,469.90 and 11,198.90

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Solution

The fourth proportional to 20,630.34, 28,469.90 and 11,198.90 is: 15,454.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,630.34 : 28,469.90 = 11,198.90 : x
  2. Step 2: Convert to fraction form
    20,630.34/28,469.90 = 11,198.90/x
  3. Step 3: Cross multiply
    20,630.34x = 28,469.90 × 11,198.90
  4. Step 4: Simplify right side
    20,630.34x = 318,831,563.11
  5. Step 5: Solve for x
    x = 318,831,563.11/20,630.34
  6. Step 6: Final answer
    x = 15,454.50

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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.