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Finding the Fourth Proportional to 82.28, 122.92 and 68.60

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Solution

The fourth proportional to 82.28, 122.92 and 68.60 is: 102.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.28 : 122.92 = 68.60 : x
  2. Step 2: Convert to fraction form
    82.28/122.92 = 68.60/x
  3. Step 3: Cross multiply
    82.28x = 122.92 × 68.60
  4. Step 4: Simplify right side
    82.28x = 8,432.31
  5. Step 5: Solve for x
    x = 8,432.31/82.28
  6. Step 6: Final answer
    x = 102.48

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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.