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Finding the Fourth Proportional to 94.19, 128.81 and 92.76

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Solution

The fourth proportional to 94.19, 128.81 and 92.76 is: 126.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.19 : 128.81 = 92.76 : x
  2. Step 2: Convert to fraction form
    94.19/128.81 = 92.76/x
  3. Step 3: Cross multiply
    94.19x = 128.81 × 92.76
  4. Step 4: Simplify right side
    94.19x = 11,947.95
  5. Step 5: Solve for x
    x = 11,947.95/94.19
  6. Step 6: Final answer
    x = 126.86

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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.