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Finding the Fourth Proportional to 258.44, 387.20 and 171.72

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Solution

The fourth proportional to 258.44, 387.20 and 171.72 is: 257.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.44 : 387.20 = 171.72 : x
  2. Step 2: Convert to fraction form
    258.44/387.20 = 171.72/x
  3. Step 3: Cross multiply
    258.44x = 387.20 × 171.72
  4. Step 4: Simplify right side
    258.44x = 66,490.41
  5. Step 5: Solve for x
    x = 66,490.41/258.44
  6. Step 6: Final answer
    x = 257.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.