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Finding the Fourth Proportional to 92.35, 138.39 and 84.25

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Solution

The fourth proportional to 92.35, 138.39 and 84.25 is: 126.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.35 : 138.39 = 84.25 : x
  2. Step 2: Convert to fraction form
    92.35/138.39 = 84.25/x
  3. Step 3: Cross multiply
    92.35x = 138.39 × 84.25
  4. Step 4: Simplify right side
    92.35x = 11,659.36
  5. Step 5: Solve for x
    x = 11,659.36/92.35
  6. Step 6: Final answer
    x = 126.25

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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.