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Finding the Fourth Proportional to 181.93, 251.19 and 138.49

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Solution

The fourth proportional to 181.93, 251.19 and 138.49 is: 191.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.93 : 251.19 = 138.49 : x
  2. Step 2: Convert to fraction form
    181.93/251.19 = 138.49/x
  3. Step 3: Cross multiply
    181.93x = 251.19 × 138.49
  4. Step 4: Simplify right side
    181.93x = 34,786.61
  5. Step 5: Solve for x
    x = 34,786.61/181.93
  6. Step 6: Final answer
    x = 191.21

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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.