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Finding the Fourth Proportional to 8,590.72, 12,884.54 and 3,909.64

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Solution

The fourth proportional to 8,590.72, 12,884.54 and 3,909.64 is: 5,863.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,590.72 : 12,884.54 = 3,909.64 : x
  2. Step 2: Convert to fraction form
    8,590.72/12,884.54 = 3,909.64/x
  3. Step 3: Cross multiply
    8,590.72x = 12,884.54 × 3,909.64
  4. Step 4: Simplify right side
    8,590.72x = 50,373,912.97
  5. Step 5: Solve for x
    x = 50,373,912.97/8,590.72
  6. Step 6: Final answer
    x = 5,863.76

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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.