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Finding the Fourth Proportional to 8,391.90, 12,589.47 and 2,843.76

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Solution

The fourth proportional to 8,391.90, 12,589.47 and 2,843.76 is: 4,266.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.90 : 12,589.47 = 2,843.76 : x
  2. Step 2: Convert to fraction form
    8,391.90/12,589.47 = 2,843.76/x
  3. Step 3: Cross multiply
    8,391.90x = 12,589.47 × 2,843.76
  4. Step 4: Simplify right side
    8,391.90x = 35,801,431.21
  5. Step 5: Solve for x
    x = 35,801,431.21/8,391.90
  6. Step 6: Final answer
    x = 4,266.19

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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.