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Finding the Fourth Proportional to 181.62, 272.41 and 78.85

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Solution

The fourth proportional to 181.62, 272.41 and 78.85 is: 118.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.62 : 272.41 = 78.85 : x
  2. Step 2: Convert to fraction form
    181.62/272.41 = 78.85/x
  3. Step 3: Cross multiply
    181.62x = 272.41 × 78.85
  4. Step 4: Simplify right side
    181.62x = 21,479.53
  5. Step 5: Solve for x
    x = 21,479.53/181.62
  6. Step 6: Final answer
    x = 118.27

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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.