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Finding the Fourth Proportional to 638.16, 958.46 and 396.38

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Solution

The fourth proportional to 638.16, 958.46 and 396.38 is: 595.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.16 : 958.46 = 396.38 : x
  2. Step 2: Convert to fraction form
    638.16/958.46 = 396.38/x
  3. Step 3: Cross multiply
    638.16x = 958.46 × 396.38
  4. Step 4: Simplify right side
    638.16x = 379,907.60
  5. Step 5: Solve for x
    x = 379,907.60/638.16
  6. Step 6: Final answer
    x = 595.32

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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.