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Finding the Fourth Proportional to 92.21, 138.77 and 83.81

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Solution

The fourth proportional to 92.21, 138.77 and 83.81 is: 126.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.21 : 138.77 = 83.81 : x
  2. Step 2: Convert to fraction form
    92.21/138.77 = 83.81/x
  3. Step 3: Cross multiply
    92.21x = 138.77 × 83.81
  4. Step 4: Simplify right side
    92.21x = 11,629.20
  5. Step 5: Solve for x
    x = 11,629.20/92.21
  6. Step 6: Final answer
    x = 126.12

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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.