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Finding the Fourth Proportional to 94.58, 141.80 and 81.08

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Solution

The fourth proportional to 94.58, 141.80 and 81.08 is: 121.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.58 : 141.80 = 81.08 : x
  2. Step 2: Convert to fraction form
    94.58/141.80 = 81.08/x
  3. Step 3: Cross multiply
    94.58x = 141.80 × 81.08
  4. Step 4: Simplify right side
    94.58x = 11,497.14
  5. Step 5: Solve for x
    x = 11,497.14/94.58
  6. Step 6: Final answer
    x = 121.56

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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.