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Finding the Fourth Proportional to 258.45, 386.91 and 171.69

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Solution

The fourth proportional to 258.45, 386.91 and 171.69 is: 257.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.45 : 386.91 = 171.69 : x
  2. Step 2: Convert to fraction form
    258.45/386.91 = 171.69/x
  3. Step 3: Cross multiply
    258.45x = 386.91 × 171.69
  4. Step 4: Simplify right side
    258.45x = 66,428.58
  5. Step 5: Solve for x
    x = 66,428.58/258.45
  6. Step 6: Final answer
    x = 257.03

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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.