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Finding the Fourth Proportional to 82.54, 122.82 and 78.25

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Solution

The fourth proportional to 82.54, 122.82 and 78.25 is: 116.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.54 : 122.82 = 78.25 : x
  2. Step 2: Convert to fraction form
    82.54/122.82 = 78.25/x
  3. Step 3: Cross multiply
    82.54x = 122.82 × 78.25
  4. Step 4: Simplify right side
    82.54x = 9,610.67
  5. Step 5: Solve for x
    x = 9,610.67/82.54
  6. Step 6: Final answer
    x = 116.44

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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.