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Finding the Fourth Proportional to 92.08, 126.79 and 81.78

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Solution

The fourth proportional to 92.08, 126.79 and 81.78 is: 112.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.08 : 126.79 = 81.78 : x
  2. Step 2: Convert to fraction form
    92.08/126.79 = 81.78/x
  3. Step 3: Cross multiply
    92.08x = 126.79 × 81.78
  4. Step 4: Simplify right side
    92.08x = 10,368.89
  5. Step 5: Solve for x
    x = 10,368.89/92.08
  6. Step 6: Final answer
    x = 112.61

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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.