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Finding the Fourth Proportional to 255.21, 382.64 and 81.82

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Solution

The fourth proportional to 255.21, 382.64 and 81.82 is: 122.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.21 : 382.64 = 81.82 : x
  2. Step 2: Convert to fraction form
    255.21/382.64 = 81.82/x
  3. Step 3: Cross multiply
    255.21x = 382.64 × 81.82
  4. Step 4: Simplify right side
    255.21x = 31,306.24
  5. Step 5: Solve for x
    x = 31,306.24/255.21
  6. Step 6: Final answer
    x = 122.67

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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.