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Finding the Fourth Proportional to 812.11, 1,217.12 and 395.74

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Solution

The fourth proportional to 812.11, 1,217.12 and 395.74 is: 593.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.11 : 1,217.12 = 395.74 : x
  2. Step 2: Convert to fraction form
    812.11/1,217.12 = 395.74/x
  3. Step 3: Cross multiply
    812.11x = 1,217.12 × 395.74
  4. Step 4: Simplify right side
    812.11x = 481,656.98
  5. Step 5: Solve for x
    x = 481,656.98/812.11
  6. Step 6: Final answer
    x = 593.10

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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.