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Finding the Fourth Proportional to 94.31, 140.39 and 89.89

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Solution

The fourth proportional to 94.31, 140.39 and 89.89 is: 133.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.31 : 140.39 = 89.89 : x
  2. Step 2: Convert to fraction form
    94.31/140.39 = 89.89/x
  3. Step 3: Cross multiply
    94.31x = 140.39 × 89.89
  4. Step 4: Simplify right side
    94.31x = 12,619.53
  5. Step 5: Solve for x
    x = 12,619.53/94.31
  6. Step 6: Final answer
    x = 133.81

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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.