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Finding the Fourth Proportional to 138.49, 191.05 and 97.05

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Solution

The fourth proportional to 138.49, 191.05 and 97.05 is: 133.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.49 : 191.05 = 97.05 : x
  2. Step 2: Convert to fraction form
    138.49/191.05 = 97.05/x
  3. Step 3: Cross multiply
    138.49x = 191.05 × 97.05
  4. Step 4: Simplify right side
    138.49x = 18,541.40
  5. Step 5: Solve for x
    x = 18,541.40/138.49
  6. Step 6: Final answer
    x = 133.88

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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.