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Finding the Fourth Proportional to 812.93, 1,219.97 and 326.09

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Solution

The fourth proportional to 812.93, 1,219.97 and 326.09 is: 489.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.93 : 1,219.97 = 326.09 : x
  2. Step 2: Convert to fraction form
    812.93/1,219.97 = 326.09/x
  3. Step 3: Cross multiply
    812.93x = 1,219.97 × 326.09
  4. Step 4: Simplify right side
    812.93x = 397,820.02
  5. Step 5: Solve for x
    x = 397,820.02/812.93
  6. Step 6: Final answer
    x = 489.37

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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.