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Finding the Fourth Proportional to 138.23, 206.85 and 94.69

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Solution

The fourth proportional to 138.23, 206.85 and 94.69 is: 141.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.23 : 206.85 = 94.69 : x
  2. Step 2: Convert to fraction form
    138.23/206.85 = 94.69/x
  3. Step 3: Cross multiply
    138.23x = 206.85 × 94.69
  4. Step 4: Simplify right side
    138.23x = 19,585.59
  5. Step 5: Solve for x
    x = 19,585.59/138.23
  6. Step 6: Final answer
    x = 141.69

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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.