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Finding the Fourth Proportional to 258.48, 356.24 and 209.48

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Solution

The fourth proportional to 258.48, 356.24 and 209.48 is: 288.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.48 : 356.24 = 209.48 : x
  2. Step 2: Convert to fraction form
    258.48/356.24 = 209.48/x
  3. Step 3: Cross multiply
    258.48x = 356.24 × 209.48
  4. Step 4: Simplify right side
    258.48x = 74,622.33
  5. Step 5: Solve for x
    x = 74,622.33/258.48
  6. Step 6: Final answer
    x = 288.70

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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.