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Finding the Fourth Proportional to 258.53, 356.76 and 142.09

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Solution

The fourth proportional to 258.53, 356.76 and 142.09 is: 196.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.53 : 356.76 = 142.09 : x
  2. Step 2: Convert to fraction form
    258.53/356.76 = 142.09/x
  3. Step 3: Cross multiply
    258.53x = 356.76 × 142.09
  4. Step 4: Simplify right side
    258.53x = 50,691.14
  5. Step 5: Solve for x
    x = 50,691.14/258.53
  6. Step 6: Final answer
    x = 196.08

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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.