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Finding the Fourth Proportional to 264.21, 396.38 and 81.60

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Solution

The fourth proportional to 264.21, 396.38 and 81.60 is: 122.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    264.21 : 396.38 = 81.60 : x
  2. Step 2: Convert to fraction form
    264.21/396.38 = 81.60/x
  3. Step 3: Cross multiply
    264.21x = 396.38 × 81.60
  4. Step 4: Simplify right side
    264.21x = 32,344.61
  5. Step 5: Solve for x
    x = 32,344.61/264.21
  6. Step 6: Final answer
    x = 122.42

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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.