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Finding the Fourth Proportional to 138.74, 191.38 and 88.94

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Solution

The fourth proportional to 138.74, 191.38 and 88.94 is: 122.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.74 : 191.38 = 88.94 : x
  2. Step 2: Convert to fraction form
    138.74/191.38 = 88.94/x
  3. Step 3: Cross multiply
    138.74x = 191.38 × 88.94
  4. Step 4: Simplify right side
    138.74x = 17,021.34
  5. Step 5: Solve for x
    x = 17,021.34/138.74
  6. Step 6: Final answer
    x = 122.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.