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Finding the Fourth Proportional to 81.14, 112.00 and 51.67

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Solution

The fourth proportional to 81.14, 112.00 and 51.67 is: 71.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.14 : 112.00 = 51.67 : x
  2. Step 2: Convert to fraction form
    81.14/112.00 = 51.67/x
  3. Step 3: Cross multiply
    81.14x = 112.00 × 51.67
  4. Step 4: Simplify right side
    81.14x = 5,787.15
  5. Step 5: Solve for x
    x = 5,787.15/81.14
  6. Step 6: Final answer
    x = 71.33

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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.