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Finding the Fourth Proportional to 258.98, 356.93 and 209.98

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Solution

The fourth proportional to 258.98, 356.93 and 209.98 is: 289.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.98 : 356.93 = 209.98 : x
  2. Step 2: Convert to fraction form
    258.98/356.93 = 209.98/x
  3. Step 3: Cross multiply
    258.98x = 356.93 × 209.98
  4. Step 4: Simplify right side
    258.98x = 74,945.33
  5. Step 5: Solve for x
    x = 74,945.33/258.98
  6. Step 6: Final answer
    x = 289.39

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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.