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Finding the Fourth Proportional to 92.90, 138.68 and 80.75

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Solution

The fourth proportional to 92.90, 138.68 and 80.75 is: 120.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.90 : 138.68 = 80.75 : x
  2. Step 2: Convert to fraction form
    92.90/138.68 = 80.75/x
  3. Step 3: Cross multiply
    92.90x = 138.68 × 80.75
  4. Step 4: Simplify right side
    92.90x = 11,197.31
  5. Step 5: Solve for x
    x = 11,197.31/92.90
  6. Step 6: Final answer
    x = 120.54

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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.