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Finding the Fourth Proportional to 20,013.80, 29,991.90 and 8,911.40

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Solution

The fourth proportional to 20,013.80, 29,991.90 and 8,911.40 is: 13,354.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,013.80 : 29,991.90 = 8,911.40 : x
  2. Step 2: Convert to fraction form
    20,013.80/29,991.90 = 8,911.40/x
  3. Step 3: Cross multiply
    20,013.80x = 29,991.90 × 8,911.40
  4. Step 4: Simplify right side
    20,013.80x = 267,269,817.66
  5. Step 5: Solve for x
    x = 267,269,817.66/20,013.80
  6. Step 6: Final answer
    x = 13,354.28

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1.5x scale

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.