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Finding the Fourth Proportional to 181.38, 271.98 and 85.20

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Solution

The fourth proportional to 181.38, 271.98 and 85.20 is: 127.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.38 : 271.98 = 85.20 : x
  2. Step 2: Convert to fraction form
    181.38/271.98 = 85.20/x
  3. Step 3: Cross multiply
    181.38x = 271.98 × 85.20
  4. Step 4: Simplify right side
    181.38x = 23,172.70
  5. Step 5: Solve for x
    x = 23,172.70/181.38
  6. Step 6: Final answer
    x = 127.76

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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.