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Finding the Fourth Proportional to 258.46, 356.60 and 153.55

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Solution

The fourth proportional to 258.46, 356.60 and 153.55 is: 211.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.46 : 356.60 = 153.55 : x
  2. Step 2: Convert to fraction form
    258.46/356.60 = 153.55/x
  3. Step 3: Cross multiply
    258.46x = 356.60 × 153.55
  4. Step 4: Simplify right side
    258.46x = 54,755.93
  5. Step 5: Solve for x
    x = 54,755.93/258.46
  6. Step 6: Final answer
    x = 211.85

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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.