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Finding the Fourth Proportional to 138.43, 191.06 and 83.17

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Solution

The fourth proportional to 138.43, 191.06 and 83.17 is: 114.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.43 : 191.06 = 83.17 : x
  2. Step 2: Convert to fraction form
    138.43/191.06 = 83.17/x
  3. Step 3: Cross multiply
    138.43x = 191.06 × 83.17
  4. Step 4: Simplify right side
    138.43x = 15,890.46
  5. Step 5: Solve for x
    x = 15,890.46/138.43
  6. Step 6: Final answer
    x = 114.79

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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.