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Finding the Fourth Proportional to 82.66, 123.42 and 81.84

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Solution

The fourth proportional to 82.66, 123.42 and 81.84 is: 122.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.66 : 123.42 = 81.84 : x
  2. Step 2: Convert to fraction form
    82.66/123.42 = 81.84/x
  3. Step 3: Cross multiply
    82.66x = 123.42 × 81.84
  4. Step 4: Simplify right side
    82.66x = 10,101.07
  5. Step 5: Solve for x
    x = 10,101.07/82.66
  6. Step 6: Final answer
    x = 122.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.