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Finding the Fourth Proportional to 258.31, 356.44 and 153.39

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Solution

The fourth proportional to 258.31, 356.44 and 153.39 is: 211.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.31 : 356.44 = 153.39 : x
  2. Step 2: Convert to fraction form
    258.31/356.44 = 153.39/x
  3. Step 3: Cross multiply
    258.31x = 356.44 × 153.39
  4. Step 4: Simplify right side
    258.31x = 54,674.33
  5. Step 5: Solve for x
    x = 54,674.33/258.31
  6. Step 6: Final answer
    x = 211.66

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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.