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Finding the Fourth Proportional to 73.82, 111.24 and 66.61

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Solution

The fourth proportional to 73.82, 111.24 and 66.61 is: 100.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.82 : 111.24 = 66.61 : x
  2. Step 2: Convert to fraction form
    73.82/111.24 = 66.61/x
  3. Step 3: Cross multiply
    73.82x = 111.24 × 66.61
  4. Step 4: Simplify right side
    73.82x = 7,409.70
  5. Step 5: Solve for x
    x = 7,409.70/73.82
  6. Step 6: Final answer
    x = 100.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.