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Finding the Fourth Proportional to 225.78, 339.27 and 211.20

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Solution

The fourth proportional to 225.78, 339.27 and 211.20 is: 317.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.78 : 339.27 = 211.20 : x
  2. Step 2: Convert to fraction form
    225.78/339.27 = 211.20/x
  3. Step 3: Cross multiply
    225.78x = 339.27 × 211.20
  4. Step 4: Simplify right side
    225.78x = 71,653.82
  5. Step 5: Solve for x
    x = 71,653.82/225.78
  6. Step 6: Final answer
    x = 317.36

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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.