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Finding the Fourth Proportional to 257.73, 355.08 and 211.11

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Solution

The fourth proportional to 257.73, 355.08 and 211.11 is: 290.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.73 : 355.08 = 211.11 : x
  2. Step 2: Convert to fraction form
    257.73/355.08 = 211.11/x
  3. Step 3: Cross multiply
    257.73x = 355.08 × 211.11
  4. Step 4: Simplify right side
    257.73x = 74,960.40
  5. Step 5: Solve for x
    x = 74,960.40/257.73
  6. Step 6: Final answer
    x = 290.85

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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.