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Finding the Fourth Proportional to 258.79, 357.12 and 142.35

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Solution

The fourth proportional to 258.79, 357.12 and 142.35 is: 196.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.79 : 357.12 = 142.35 : x
  2. Step 2: Convert to fraction form
    258.79/357.12 = 142.35/x
  3. Step 3: Cross multiply
    258.79x = 357.12 × 142.35
  4. Step 4: Simplify right side
    258.79x = 50,836.10
  5. Step 5: Solve for x
    x = 50,836.10/258.79
  6. Step 6: Final answer
    x = 196.44

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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.