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Finding the Fourth Proportional to 82.09, 122.97 and 71.70

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Solution

The fourth proportional to 82.09, 122.97 and 71.70 is: 107.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.09 : 122.97 = 71.70 : x
  2. Step 2: Convert to fraction form
    82.09/122.97 = 71.70/x
  3. Step 3: Cross multiply
    82.09x = 122.97 × 71.70
  4. Step 4: Simplify right side
    82.09x = 8,816.95
  5. Step 5: Solve for x
    x = 8,816.95/82.09
  6. Step 6: Final answer
    x = 107.41

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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.