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Finding the Fourth Proportional to 94.33, 140.66 and 81.58

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Solution

The fourth proportional to 94.33, 140.66 and 81.58 is: 121.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.33 : 140.66 = 81.58 : x
  2. Step 2: Convert to fraction form
    94.33/140.66 = 81.58/x
  3. Step 3: Cross multiply
    94.33x = 140.66 × 81.58
  4. Step 4: Simplify right side
    94.33x = 11,475.04
  5. Step 5: Solve for x
    x = 11,475.04/94.33
  6. Step 6: Final answer
    x = 121.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.