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Finding the Fourth Proportional to 94.98, 142.30 and 81.32

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Solution

The fourth proportional to 94.98, 142.30 and 81.32 is: 121.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.98 : 142.30 = 81.32 : x
  2. Step 2: Convert to fraction form
    94.98/142.30 = 81.32/x
  3. Step 3: Cross multiply
    94.98x = 142.30 × 81.32
  4. Step 4: Simplify right side
    94.98x = 11,571.84
  5. Step 5: Solve for x
    x = 11,571.84/94.98
  6. Step 6: Final answer
    x = 121.83

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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.