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Finding the Fourth Proportional to 92.78, 138.97 and 38.51

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Solution

The fourth proportional to 92.78, 138.97 and 38.51 is: 57.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.78 : 138.97 = 38.51 : x
  2. Step 2: Convert to fraction form
    92.78/138.97 = 38.51/x
  3. Step 3: Cross multiply
    92.78x = 138.97 × 38.51
  4. Step 4: Simplify right side
    92.78x = 5,351.64
  5. Step 5: Solve for x
    x = 5,351.64/92.78
  6. Step 6: Final answer
    x = 57.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.