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Finding the Fourth Proportional to 92.55, 127.73 and 81.61

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Solution

The fourth proportional to 92.55, 127.73 and 81.61 is: 112.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.55 : 127.73 = 81.61 : x
  2. Step 2: Convert to fraction form
    92.55/127.73 = 81.61/x
  3. Step 3: Cross multiply
    92.55x = 127.73 × 81.61
  4. Step 4: Simplify right side
    92.55x = 10,424.05
  5. Step 5: Solve for x
    x = 10,424.05/92.55
  6. Step 6: Final answer
    x = 112.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.