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Finding the Fourth Proportional to 181.72, 272.16 and 138.44

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Solution

The fourth proportional to 181.72, 272.16 and 138.44 is: 207.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.72 : 272.16 = 138.44 : x
  2. Step 2: Convert to fraction form
    181.72/272.16 = 138.44/x
  3. Step 3: Cross multiply
    181.72x = 272.16 × 138.44
  4. Step 4: Simplify right side
    181.72x = 37,677.83
  5. Step 5: Solve for x
    x = 37,677.83/181.72
  6. Step 6: Final answer
    x = 207.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.