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Finding the Fourth Proportional to 258.62, 356.92 and 142.20

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Solution

The fourth proportional to 258.62, 356.92 and 142.20 is: 196.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.62 : 356.92 = 142.20 : x
  2. Step 2: Convert to fraction form
    258.62/356.92 = 142.20/x
  3. Step 3: Cross multiply
    258.62x = 356.92 × 142.20
  4. Step 4: Simplify right side
    258.62x = 50,754.02
  5. Step 5: Solve for x
    x = 50,754.02/258.62
  6. Step 6: Final answer
    x = 196.25

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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.