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Finding the Fourth Proportional to 181.05, 271.70 and 78.38

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Solution

The fourth proportional to 181.05, 271.70 and 78.38 is: 117.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.05 : 271.70 = 78.38 : x
  2. Step 2: Convert to fraction form
    181.05/271.70 = 78.38/x
  3. Step 3: Cross multiply
    181.05x = 271.70 × 78.38
  4. Step 4: Simplify right side
    181.05x = 21,294.10
  5. Step 5: Solve for x
    x = 21,294.10/181.05
  6. Step 6: Final answer
    x = 117.61

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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.