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Finding the Fourth Proportional to 74.82, 103.11 and 69.81

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Solution

The fourth proportional to 74.82, 103.11 and 69.81 is: 96.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.82 : 103.11 = 69.81 : x
  2. Step 2: Convert to fraction form
    74.82/103.11 = 69.81/x
  3. Step 3: Cross multiply
    74.82x = 103.11 × 69.81
  4. Step 4: Simplify right side
    74.82x = 7,198.11
  5. Step 5: Solve for x
    x = 7,198.11/74.82
  6. Step 6: Final answer
    x = 96.21

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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.