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Finding the Fourth Proportional to 258.56, 356.78 and 153.61

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Solution

The fourth proportional to 258.56, 356.78 and 153.61 is: 211.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.56 : 356.78 = 153.61 : x
  2. Step 2: Convert to fraction form
    258.56/356.78 = 153.61/x
  3. Step 3: Cross multiply
    258.56x = 356.78 × 153.61
  4. Step 4: Simplify right side
    258.56x = 54,803.19
  5. Step 5: Solve for x
    x = 54,803.19/258.56
  6. Step 6: Final answer
    x = 211.96

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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.