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Finding the Fourth Proportional to 258.02, 387.15 and 171.39

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Solution

The fourth proportional to 258.02, 387.15 and 171.39 is: 257.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.02 : 387.15 = 171.39 : x
  2. Step 2: Convert to fraction form
    258.02/387.15 = 171.39/x
  3. Step 3: Cross multiply
    258.02x = 387.15 × 171.39
  4. Step 4: Simplify right side
    258.02x = 66,352.27
  5. Step 5: Solve for x
    x = 66,352.27/258.02
  6. Step 6: Final answer
    x = 257.16

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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.