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Finding the Fourth Proportional to 81.97, 123.01 and 30.66

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Solution

The fourth proportional to 81.97, 123.01 and 30.66 is: 46.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.97 : 123.01 = 30.66 : x
  2. Step 2: Convert to fraction form
    81.97/123.01 = 30.66/x
  3. Step 3: Cross multiply
    81.97x = 123.01 × 30.66
  4. Step 4: Simplify right side
    81.97x = 3,771.49
  5. Step 5: Solve for x
    x = 3,771.49/81.97
  6. Step 6: Final answer
    x = 46.01

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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.