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Finding the Fourth Proportional to 8,791.20, 12,139.20 and 8,294.40

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Solution

The fourth proportional to 8,791.20, 12,139.20 and 8,294.40 is: 11,453.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,791.20 : 12,139.20 = 8,294.40 : x
  2. Step 2: Convert to fraction form
    8,791.20/12,139.20 = 8,294.40/x
  3. Step 3: Cross multiply
    8,791.20x = 12,139.20 × 8,294.40
  4. Step 4: Simplify right side
    8,791.20x = 100,687,380.48
  5. Step 5: Solve for x
    x = 100,687,380.48/8,791.20
  6. Step 6: Final answer
    x = 11,453.20

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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.