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Finding the Fourth Proportional to 8,118.60, 12,168.90 and 3,186.60

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Solution

The fourth proportional to 8,118.60, 12,168.90 and 3,186.60 is: 4,776.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,118.60 : 12,168.90 = 3,186.60 : x
  2. Step 2: Convert to fraction form
    8,118.60/12,168.90 = 3,186.60/x
  3. Step 3: Cross multiply
    8,118.60x = 12,168.90 × 3,186.60
  4. Step 4: Simplify right side
    8,118.60x = 38,777,416.74
  5. Step 5: Solve for x
    x = 38,777,416.74/8,118.60
  6. Step 6: Final answer
    x = 4,776.37

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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.