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Finding the Fourth Proportional to 258.20, 356.14 and 154.72

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Solution

The fourth proportional to 258.20, 356.14 and 154.72 is: 213.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.20 : 356.14 = 154.72 : x
  2. Step 2: Convert to fraction form
    258.20/356.14 = 154.72/x
  3. Step 3: Cross multiply
    258.20x = 356.14 × 154.72
  4. Step 4: Simplify right side
    258.20x = 55,101.98
  5. Step 5: Solve for x
    x = 55,101.98/258.20
  6. Step 6: Final answer
    x = 213.41

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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.