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Finding the Fourth Proportional to 74.78, 111.63 and 67.94

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Solution

The fourth proportional to 74.78, 111.63 and 67.94 is: 101.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.78 : 111.63 = 67.94 : x
  2. Step 2: Convert to fraction form
    74.78/111.63 = 67.94/x
  3. Step 3: Cross multiply
    74.78x = 111.63 × 67.94
  4. Step 4: Simplify right side
    74.78x = 7,584.14
  5. Step 5: Solve for x
    x = 7,584.14/74.78
  6. Step 6: Final answer
    x = 101.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.