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Finding the Fourth Proportional to 7,638, 11,458.92 and 2,166

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Solution

The fourth proportional to 7,638, 11,458.92 and 2,166 is: 3,249.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,638 : 11,458.92 = 2,166 : x
  2. Step 2: Convert to fraction form
    7,638/11,458.92 = 2,166/x
  3. Step 3: Cross multiply
    7,638x = 11,458.92 × 2,166
  4. Step 4: Simplify right side
    7,638x = 24,820,020.72
  5. Step 5: Solve for x
    x = 24,820,020.72/7,638
  6. Step 6: Final answer
    x = 3,249.54

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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.