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Finding the Fourth Proportional to 7,855.67, 11,781.14 and 2,857.41

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Solution

The fourth proportional to 7,855.67, 11,781.14 and 2,857.41 is: 4,285.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,855.67 : 11,781.14 = 2,857.41 : x
  2. Step 2: Convert to fraction form
    7,855.67/11,781.14 = 2,857.41/x
  3. Step 3: Cross multiply
    7,855.67x = 11,781.14 × 2,857.41
  4. Step 4: Simplify right side
    7,855.67x = 33,663,532.96
  5. Step 5: Solve for x
    x = 33,663,532.96/7,855.67
  6. Step 6: Final answer
    x = 4,285.25

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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.