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Finding the Fourth Proportional to 380.98, 571.06 and 251.11

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Solution

The fourth proportional to 380.98, 571.06 and 251.11 is: 376.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.98 : 571.06 = 251.11 : x
  2. Step 2: Convert to fraction form
    380.98/571.06 = 251.11/x
  3. Step 3: Cross multiply
    380.98x = 571.06 × 251.11
  4. Step 4: Simplify right side
    380.98x = 143,394.77
  5. Step 5: Solve for x
    x = 143,394.77/380.98
  6. Step 6: Final answer
    x = 376.39

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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.