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Finding the Fourth Proportional to 92.00, 138.11 and 85.15

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Solution

The fourth proportional to 92.00, 138.11 and 85.15 is: 127.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.00 : 138.11 = 85.15 : x
  2. Step 2: Convert to fraction form
    92.00/138.11 = 85.15/x
  3. Step 3: Cross multiply
    92.00x = 138.11 × 85.15
  4. Step 4: Simplify right side
    92.00x = 11,759.81
  5. Step 5: Solve for x
    x = 11,759.81/92.00
  6. Step 6: Final answer
    x = 127.82

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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.