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Finding the Fourth Proportional to 264.15, 396.24 and 81.57

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Solution

The fourth proportional to 264.15, 396.24 and 81.57 is: 122.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    264.15 : 396.24 = 81.57 : x
  2. Step 2: Convert to fraction form
    264.15/396.24 = 81.57/x
  3. Step 3: Cross multiply
    264.15x = 396.24 × 81.57
  4. Step 4: Simplify right side
    264.15x = 32,321.30
  5. Step 5: Solve for x
    x = 32,321.30/264.15
  6. Step 6: Final answer
    x = 122.36

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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.