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Finding the Fourth Proportional to 2,115.56, 3,174.42 and 817.94

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Solution

The fourth proportional to 2,115.56, 3,174.42 and 817.94 is: 1,227.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.56 : 3,174.42 = 817.94 : x
  2. Step 2: Convert to fraction form
    2,115.56/3,174.42 = 817.94/x
  3. Step 3: Cross multiply
    2,115.56x = 3,174.42 × 817.94
  4. Step 4: Simplify right side
    2,115.56x = 2,596,485.09
  5. Step 5: Solve for x
    x = 2,596,485.09/2,115.56
  6. Step 6: Final answer
    x = 1,227.33

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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.