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Finding the Fourth Proportional to 92.30, 126.87 and 81.32

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Solution

The fourth proportional to 92.30, 126.87 and 81.32 is: 111.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.30 : 126.87 = 81.32 : x
  2. Step 2: Convert to fraction form
    92.30/126.87 = 81.32/x
  3. Step 3: Cross multiply
    92.30x = 126.87 × 81.32
  4. Step 4: Simplify right side
    92.30x = 10,316.66
  5. Step 5: Solve for x
    x = 10,316.66/92.30
  6. Step 6: Final answer
    x = 111.77

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.