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Finding the Fourth Proportional to 82.02, 122.82 and 69.15

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Solution

The fourth proportional to 82.02, 122.82 and 69.15 is: 103.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.02 : 122.82 = 69.15 : x
  2. Step 2: Convert to fraction form
    82.02/122.82 = 69.15/x
  3. Step 3: Cross multiply
    82.02x = 122.82 × 69.15
  4. Step 4: Simplify right side
    82.02x = 8,493.00
  5. Step 5: Solve for x
    x = 8,493.00/82.02
  6. Step 6: Final answer
    x = 103.55

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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.