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Finding the Fourth Proportional to 8,451.59, 12,679.61 and 3,186.68

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Solution

The fourth proportional to 8,451.59, 12,679.61 and 3,186.68 is: 4,780.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,451.59 : 12,679.61 = 3,186.68 : x
  2. Step 2: Convert to fraction form
    8,451.59/12,679.61 = 3,186.68/x
  3. Step 3: Cross multiply
    8,451.59x = 12,679.61 × 3,186.68
  4. Step 4: Simplify right side
    8,451.59x = 40,405,780.26
  5. Step 5: Solve for x
    x = 40,405,780.26/8,451.59
  6. Step 6: Final answer
    x = 4,780.85

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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.