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Finding the Fourth Proportional to 92.05, 137.83 and 86.77

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Solution

The fourth proportional to 92.05, 137.83 and 86.77 is: 129.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.05 : 137.83 = 86.77 : x
  2. Step 2: Convert to fraction form
    92.05/137.83 = 86.77/x
  3. Step 3: Cross multiply
    92.05x = 137.83 × 86.77
  4. Step 4: Simplify right side
    92.05x = 11,958.60
  5. Step 5: Solve for x
    x = 11,958.60/92.05
  6. Step 6: Final answer
    x = 129.92

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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.