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Finding the Fourth Proportional to 82.67, 113.97 and 72.21

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Solution

The fourth proportional to 82.67, 113.97 and 72.21 is: 99.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.67 : 113.97 = 72.21 : x
  2. Step 2: Convert to fraction form
    82.67/113.97 = 72.21/x
  3. Step 3: Cross multiply
    82.67x = 113.97 × 72.21
  4. Step 4: Simplify right side
    82.67x = 8,229.77
  5. Step 5: Solve for x
    x = 8,229.77/82.67
  6. Step 6: Final answer
    x = 99.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.