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Finding the Fourth Proportional to 258.78, 356.81 and 177.73

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Solution

The fourth proportional to 258.78, 356.81 and 177.73 is: 245.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.78 : 356.81 = 177.73 : x
  2. Step 2: Convert to fraction form
    258.78/356.81 = 177.73/x
  3. Step 3: Cross multiply
    258.78x = 356.81 × 177.73
  4. Step 4: Simplify right side
    258.78x = 63,414.06
  5. Step 5: Solve for x
    x = 63,414.06/258.78
  6. Step 6: Final answer
    x = 245.05

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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.