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Finding the Fourth Proportional to 258.66, 354.74 and 254.21

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Solution

The fourth proportional to 258.66, 354.74 and 254.21 is: 348.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.66 : 354.74 = 254.21 : x
  2. Step 2: Convert to fraction form
    258.66/354.74 = 254.21/x
  3. Step 3: Cross multiply
    258.66x = 354.74 × 254.21
  4. Step 4: Simplify right side
    258.66x = 90,175.41
  5. Step 5: Solve for x
    x = 90,175.41/258.66
  6. Step 6: Final answer
    x = 348.63

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.