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Finding the Fourth Proportional to 258.39, 356.81 and 192.78

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Solution

The fourth proportional to 258.39, 356.81 and 192.78 is: 266.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.39 : 356.81 = 192.78 : x
  2. Step 2: Convert to fraction form
    258.39/356.81 = 192.78/x
  3. Step 3: Cross multiply
    258.39x = 356.81 × 192.78
  4. Step 4: Simplify right side
    258.39x = 68,787.21
  5. Step 5: Solve for x
    x = 68,787.21/258.39
  6. Step 6: Final answer
    x = 266.21

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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.