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Finding the Fourth Proportional to 94.95, 142.29 and 81.36

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Solution

The fourth proportional to 94.95, 142.29 and 81.36 is: 121.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.95 : 142.29 = 81.36 : x
  2. Step 2: Convert to fraction form
    94.95/142.29 = 81.36/x
  3. Step 3: Cross multiply
    94.95x = 142.29 × 81.36
  4. Step 4: Simplify right side
    94.95x = 11,576.71
  5. Step 5: Solve for x
    x = 11,576.71/94.95
  6. Step 6: Final answer
    x = 121.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.