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Finding the Fourth Proportional to 258.13, 356.31 and 154.63

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Solution

The fourth proportional to 258.13, 356.31 and 154.63 is: 213.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.13 : 356.31 = 154.63 : x
  2. Step 2: Convert to fraction form
    258.13/356.31 = 154.63/x
  3. Step 3: Cross multiply
    258.13x = 356.31 × 154.63
  4. Step 4: Simplify right side
    258.13x = 55,093.66
  5. Step 5: Solve for x
    x = 55,093.66/258.13
  6. Step 6: Final answer
    x = 213.44

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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.