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Finding the Fourth Proportional to 258.91, 357.20 and 148.31

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Solution

The fourth proportional to 258.91, 357.20 and 148.31 is: 204.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.91 : 357.20 = 148.31 : x
  2. Step 2: Convert to fraction form
    258.91/357.20 = 148.31/x
  3. Step 3: Cross multiply
    258.91x = 357.20 × 148.31
  4. Step 4: Simplify right side
    258.91x = 52,974.92
  5. Step 5: Solve for x
    x = 52,974.92/258.91
  6. Step 6: Final answer
    x = 204.61

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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.