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Finding the Fourth Proportional to 7,896.72, 11,819.35 and 5,815.90

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Solution

The fourth proportional to 7,896.72, 11,819.35 and 5,815.90 is: 8,704.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,896.72 : 11,819.35 = 5,815.90 : x
  2. Step 2: Convert to fraction form
    7,896.72/11,819.35 = 5,815.90/x
  3. Step 3: Cross multiply
    7,896.72x = 11,819.35 × 5,815.90
  4. Step 4: Simplify right side
    7,896.72x = 68,740,157.67
  5. Step 5: Solve for x
    x = 68,740,157.67/7,896.72
  6. Step 6: Final answer
    x = 8,704.90

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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.