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Finding the Fourth Proportional to 258.84, 357.17 and 142.38

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Solution

The fourth proportional to 258.84, 357.17 and 142.38 is: 196.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.84 : 357.17 = 142.38 : x
  2. Step 2: Convert to fraction form
    258.84/357.17 = 142.38/x
  3. Step 3: Cross multiply
    258.84x = 357.17 × 142.38
  4. Step 4: Simplify right side
    258.84x = 50,853.15
  5. Step 5: Solve for x
    x = 50,853.15/258.84
  6. Step 6: Final answer
    x = 196.47

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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.