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Finding the Fourth Proportional to 264.16, 396.31 and 81.56

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Solution

The fourth proportional to 264.16, 396.31 and 81.56 is: 122.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    264.16 : 396.31 = 81.56 : x
  2. Step 2: Convert to fraction form
    264.16/396.31 = 81.56/x
  3. Step 3: Cross multiply
    264.16x = 396.31 × 81.56
  4. Step 4: Simplify right side
    264.16x = 32,320.86
  5. Step 5: Solve for x
    x = 32,320.86/264.16
  6. Step 6: Final answer
    x = 122.35

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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.