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Finding the Fourth Proportional to 92.35, 137.73 and 78.73

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Solution

The fourth proportional to 92.35, 137.73 and 78.73 is: 117.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.35 : 137.73 = 78.73 : x
  2. Step 2: Convert to fraction form
    92.35/137.73 = 78.73/x
  3. Step 3: Cross multiply
    92.35x = 137.73 × 78.73
  4. Step 4: Simplify right side
    92.35x = 10,843.48
  5. Step 5: Solve for x
    x = 10,843.48/92.35
  6. Step 6: Final answer
    x = 117.42

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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.