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Finding the Fourth Proportional to 258.63, 387.43 and 171.70

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Solution

The fourth proportional to 258.63, 387.43 and 171.70 is: 257.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.63 : 387.43 = 171.70 : x
  2. Step 2: Convert to fraction form
    258.63/387.43 = 171.70/x
  3. Step 3: Cross multiply
    258.63x = 387.43 × 171.70
  4. Step 4: Simplify right side
    258.63x = 66,523.48
  5. Step 5: Solve for x
    x = 66,523.48/258.63
  6. Step 6: Final answer
    x = 257.22

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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.