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Finding the Fourth Proportional to 72.82, 99.79 and 71.38

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Solution

The fourth proportional to 72.82, 99.79 and 71.38 is: 97.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.82 : 99.79 = 71.38 : x
  2. Step 2: Convert to fraction form
    72.82/99.79 = 71.38/x
  3. Step 3: Cross multiply
    72.82x = 99.79 × 71.38
  4. Step 4: Simplify right side
    72.82x = 7,123.01
  5. Step 5: Solve for x
    x = 7,123.01/72.82
  6. Step 6: Final answer
    x = 97.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.