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Finding the Fourth Proportional to 181.85, 272.85 and 85.65

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Solution

The fourth proportional to 181.85, 272.85 and 85.65 is: 128.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.85 : 272.85 = 85.65 : x
  2. Step 2: Convert to fraction form
    181.85/272.85 = 85.65/x
  3. Step 3: Cross multiply
    181.85x = 272.85 × 85.65
  4. Step 4: Simplify right side
    181.85x = 23,369.60
  5. Step 5: Solve for x
    x = 23,369.60/181.85
  6. Step 6: Final answer
    x = 128.51

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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.