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Finding the Fourth Proportional to 251.72, 379.39 and 238.28

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Solution

The fourth proportional to 251.72, 379.39 and 238.28 is: 359.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.72 : 379.39 = 238.28 : x
  2. Step 2: Convert to fraction form
    251.72/379.39 = 238.28/x
  3. Step 3: Cross multiply
    251.72x = 379.39 × 238.28
  4. Step 4: Simplify right side
    251.72x = 90,401.05
  5. Step 5: Solve for x
    x = 90,401.05/251.72
  6. Step 6: Final answer
    x = 359.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.