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Finding the Fourth Proportional to 812.85, 1,220.18 and 326.23

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Solution

The fourth proportional to 812.85, 1,220.18 and 326.23 is: 489.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.85 : 1,220.18 = 326.23 : x
  2. Step 2: Convert to fraction form
    812.85/1,220.18 = 326.23/x
  3. Step 3: Cross multiply
    812.85x = 1,220.18 × 326.23
  4. Step 4: Simplify right side
    812.85x = 398,059.32
  5. Step 5: Solve for x
    x = 398,059.32/812.85
  6. Step 6: Final answer
    x = 489.71

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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.