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Finding the Fourth Proportional to 2,133.78, 3,198.48 and 817.22

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Solution

The fourth proportional to 2,133.78, 3,198.48 and 817.22 is: 1,224.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,133.78 : 3,198.48 = 817.22 : x
  2. Step 2: Convert to fraction form
    2,133.78/3,198.48 = 817.22/x
  3. Step 3: Cross multiply
    2,133.78x = 3,198.48 × 817.22
  4. Step 4: Simplify right side
    2,133.78x = 2,613,857.74
  5. Step 5: Solve for x
    x = 2,613,857.74/2,133.78
  6. Step 6: Final answer
    x = 1,224.99

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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.