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Finding the Fourth Proportional to 258.90, 357.21 and 171.42

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Solution

The fourth proportional to 258.90, 357.21 and 171.42 is: 236.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.90 : 357.21 = 171.42 : x
  2. Step 2: Convert to fraction form
    258.90/357.21 = 171.42/x
  3. Step 3: Cross multiply
    258.90x = 357.21 × 171.42
  4. Step 4: Simplify right side
    258.90x = 61,232.94
  5. Step 5: Solve for x
    x = 61,232.94/258.90
  6. Step 6: Final answer
    x = 236.51

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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.