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Finding the Fourth Proportional to 660.38, 911.32 and 398.44

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Solution

The fourth proportional to 660.38, 911.32 and 398.44 is: 549.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.38 : 911.32 = 398.44 : x
  2. Step 2: Convert to fraction form
    660.38/911.32 = 398.44/x
  3. Step 3: Cross multiply
    660.38x = 911.32 × 398.44
  4. Step 4: Simplify right side
    660.38x = 363,106.48
  5. Step 5: Solve for x
    x = 363,106.48/660.38
  6. Step 6: Final answer
    x = 549.85

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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.