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Finding the Fourth Proportional to 391.54, 539.18 and 383.44

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Solution

The fourth proportional to 391.54, 539.18 and 383.44 is: 528.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.54 : 539.18 = 383.44 : x
  2. Step 2: Convert to fraction form
    391.54/539.18 = 383.44/x
  3. Step 3: Cross multiply
    391.54x = 539.18 × 383.44
  4. Step 4: Simplify right side
    391.54x = 206,743.18
  5. Step 5: Solve for x
    x = 206,743.18/391.54
  6. Step 6: Final answer
    x = 528.03

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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.