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Finding the Fourth Proportional to 2,115.86, 3,174.78 and 817

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Solution

The fourth proportional to 2,115.86, 3,174.78 and 817 is: 1,225.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.86 : 3,174.78 = 817 : x
  2. Step 2: Convert to fraction form
    2,115.86/3,174.78 = 817/x
  3. Step 3: Cross multiply
    2,115.86x = 3,174.78 × 817
  4. Step 4: Simplify right side
    2,115.86x = 2,593,795.26
  5. Step 5: Solve for x
    x = 2,593,795.26/2,115.86
  6. Step 6: Final answer
    x = 1,225.88

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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.