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Finding the Fourth Proportional to 138.72, 191.44 and 92.06

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Solution

The fourth proportional to 138.72, 191.44 and 92.06 is: 127.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.72 : 191.44 = 92.06 : x
  2. Step 2: Convert to fraction form
    138.72/191.44 = 92.06/x
  3. Step 3: Cross multiply
    138.72x = 191.44 × 92.06
  4. Step 4: Simplify right side
    138.72x = 17,623.97
  5. Step 5: Solve for x
    x = 17,623.97/138.72
  6. Step 6: Final answer
    x = 127.05

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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.