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Finding the Fourth Proportional to 138.72, 192.75 and 136.98

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Solution

The fourth proportional to 138.72, 192.75 and 136.98 is: 190.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.72 : 192.75 = 136.98 : x
  2. Step 2: Convert to fraction form
    138.72/192.75 = 136.98/x
  3. Step 3: Cross multiply
    138.72x = 192.75 × 136.98
  4. Step 4: Simplify right side
    138.72x = 26,402.90
  5. Step 5: Solve for x
    x = 26,402.90/138.72
  6. Step 6: Final answer
    x = 190.33

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.