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Finding the Fourth Proportional to 181.87, 272.72 and 84.31

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Solution

The fourth proportional to 181.87, 272.72 and 84.31 is: 126.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.87 : 272.72 = 84.31 : x
  2. Step 2: Convert to fraction form
    181.87/272.72 = 84.31/x
  3. Step 3: Cross multiply
    181.87x = 272.72 × 84.31
  4. Step 4: Simplify right side
    181.87x = 22,992.55
  5. Step 5: Solve for x
    x = 22,992.55/181.87
  6. Step 6: Final answer
    x = 126.42

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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.