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Finding the Fourth Proportional to 94.78, 131.31 and 92.66

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Solution

The fourth proportional to 94.78, 131.31 and 92.66 is: 128.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.78 : 131.31 = 92.66 : x
  2. Step 2: Convert to fraction form
    94.78/131.31 = 92.66/x
  3. Step 3: Cross multiply
    94.78x = 131.31 × 92.66
  4. Step 4: Simplify right side
    94.78x = 12,166.53
  5. Step 5: Solve for x
    x = 12,166.53/94.78
  6. Step 6: Final answer
    x = 128.36

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.