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Finding the Fourth Proportional to 8,147.18, 12,211.94 and 3,990

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Solution

The fourth proportional to 8,147.18, 12,211.94 and 3,990 is: 5,980.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,147.18 : 12,211.94 = 3,990 : x
  2. Step 2: Convert to fraction form
    8,147.18/12,211.94 = 3,990/x
  3. Step 3: Cross multiply
    8,147.18x = 12,211.94 × 3,990
  4. Step 4: Simplify right side
    8,147.18x = 48,725,640.60
  5. Step 5: Solve for x
    x = 48,725,640.60/8,147.18
  6. Step 6: Final answer
    x = 5,980.68

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.