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Finding the Fourth Proportional to 94.39, 142.09 and 81.17

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Solution

The fourth proportional to 94.39, 142.09 and 81.17 is: 122.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.39 : 142.09 = 81.17 : x
  2. Step 2: Convert to fraction form
    94.39/142.09 = 81.17/x
  3. Step 3: Cross multiply
    94.39x = 142.09 × 81.17
  4. Step 4: Simplify right side
    94.39x = 11,533.45
  5. Step 5: Solve for x
    x = 11,533.45/94.39
  6. Step 6: Final answer
    x = 122.19

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.