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Finding the Fourth Proportional to 8,609.91, 12,919.84 and 3,611.83

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Solution

The fourth proportional to 8,609.91, 12,919.84 and 3,611.83 is: 5,419.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,609.91 : 12,919.84 = 3,611.83 : x
  2. Step 2: Convert to fraction form
    8,609.91/12,919.84 = 3,611.83/x
  3. Step 3: Cross multiply
    8,609.91x = 12,919.84 × 3,611.83
  4. Step 4: Simplify right side
    8,609.91x = 46,664,265.71
  5. Step 5: Solve for x
    x = 46,664,265.71/8,609.91
  6. Step 6: Final answer
    x = 5,419.84

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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.