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Finding the Fourth Proportional to 258.46, 356.37 and 211.66

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Solution

The fourth proportional to 258.46, 356.37 and 211.66 is: 291.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.46 : 356.37 = 211.66 : x
  2. Step 2: Convert to fraction form
    258.46/356.37 = 211.66/x
  3. Step 3: Cross multiply
    258.46x = 356.37 × 211.66
  4. Step 4: Simplify right side
    258.46x = 75,429.27
  5. Step 5: Solve for x
    x = 75,429.27/258.46
  6. Step 6: Final answer
    x = 291.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.