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Finding the Fourth Proportional to 82.62, 123.26 and 81.54

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Solution

The fourth proportional to 82.62, 123.26 and 81.54 is: 121.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.62 : 123.26 = 81.54 : x
  2. Step 2: Convert to fraction form
    82.62/123.26 = 81.54/x
  3. Step 3: Cross multiply
    82.62x = 123.26 × 81.54
  4. Step 4: Simplify right side
    82.62x = 10,050.21
  5. Step 5: Solve for x
    x = 10,050.21/82.62
  6. Step 6: Final answer
    x = 121.64

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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.