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Finding the Fourth Proportional to 8,591.40, 12,891.15 and 6,404.40

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Solution

The fourth proportional to 8,591.40, 12,891.15 and 6,404.40 is: 9,609.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,591.40 : 12,891.15 = 6,404.40 : x
  2. Step 2: Convert to fraction form
    8,591.40/12,891.15 = 6,404.40/x
  3. Step 3: Cross multiply
    8,591.40x = 12,891.15 × 6,404.40
  4. Step 4: Simplify right side
    8,591.40x = 82,560,081.06
  5. Step 5: Solve for x
    x = 82,560,081.06/8,591.40
  6. Step 6: Final answer
    x = 9,609.62

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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.