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Finding the Fourth Proportional to 8,469.21, 12,678.84 and 5,339.64

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Solution

The fourth proportional to 8,469.21, 12,678.84 and 5,339.64 is: 7,993.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,469.21 : 12,678.84 = 5,339.64 : x
  2. Step 2: Convert to fraction form
    8,469.21/12,678.84 = 5,339.64/x
  3. Step 3: Cross multiply
    8,469.21x = 12,678.84 × 5,339.64
  4. Step 4: Simplify right side
    8,469.21x = 67,700,441.22
  5. Step 5: Solve for x
    x = 67,700,441.22/8,469.21
  6. Step 6: Final answer
    x = 7,993.71

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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.