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Finding the Fourth Proportional to 394.50, 543.99 and 355.23

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Solution

The fourth proportional to 394.50, 543.99 and 355.23 is: 489.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.50 : 543.99 = 355.23 : x
  2. Step 2: Convert to fraction form
    394.50/543.99 = 355.23/x
  3. Step 3: Cross multiply
    394.50x = 543.99 × 355.23
  4. Step 4: Simplify right side
    394.50x = 193,241.57
  5. Step 5: Solve for x
    x = 193,241.57/394.50
  6. Step 6: Final answer
    x = 489.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.