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Finding the Fourth Proportional to 82.25, 123.20 and 66.96

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Solution

The fourth proportional to 82.25, 123.20 and 66.96 is: 100.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.25 : 123.20 = 66.96 : x
  2. Step 2: Convert to fraction form
    82.25/123.20 = 66.96/x
  3. Step 3: Cross multiply
    82.25x = 123.20 × 66.96
  4. Step 4: Simplify right side
    82.25x = 8,249.14
  5. Step 5: Solve for x
    x = 8,249.14/82.25
  6. Step 6: Final answer
    x = 100.30

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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.