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Finding the Fourth Proportional to 82.66, 123.36 and 81.64

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Solution

The fourth proportional to 82.66, 123.36 and 81.64 is: 121.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.66 : 123.36 = 81.64 : x
  2. Step 2: Convert to fraction form
    82.66/123.36 = 81.64/x
  3. Step 3: Cross multiply
    82.66x = 123.36 × 81.64
  4. Step 4: Simplify right side
    82.66x = 10,071.11
  5. Step 5: Solve for x
    x = 10,071.11/82.66
  6. Step 6: Final answer
    x = 121.84

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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.