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Finding the Fourth Proportional to 380.73, 571.11 and 120.72

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Solution

The fourth proportional to 380.73, 571.11 and 120.72 is: 181.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.73 : 571.11 = 120.72 : x
  2. Step 2: Convert to fraction form
    380.73/571.11 = 120.72/x
  3. Step 3: Cross multiply
    380.73x = 571.11 × 120.72
  4. Step 4: Simplify right side
    380.73x = 68,942.12
  5. Step 5: Solve for x
    x = 68,942.12/380.73
  6. Step 6: Final answer
    x = 181.08

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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.