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Finding the Fourth Proportional to 391.65, 539.85 and 329.67

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Solution

The fourth proportional to 391.65, 539.85 and 329.67 is: 454.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.65 : 539.85 = 329.67 : x
  2. Step 2: Convert to fraction form
    391.65/539.85 = 329.67/x
  3. Step 3: Cross multiply
    391.65x = 539.85 × 329.67
  4. Step 4: Simplify right side
    391.65x = 177,972.35
  5. Step 5: Solve for x
    x = 177,972.35/391.65
  6. Step 6: Final answer
    x = 454.42

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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.