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Finding the Fourth Proportional to 258.08, 386.86 and 129.56

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Solution

The fourth proportional to 258.08, 386.86 and 129.56 is: 194.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.08 : 386.86 = 129.56 : x
  2. Step 2: Convert to fraction form
    258.08/386.86 = 129.56/x
  3. Step 3: Cross multiply
    258.08x = 386.86 × 129.56
  4. Step 4: Simplify right side
    258.08x = 50,121.58
  5. Step 5: Solve for x
    x = 50,121.58/258.08
  6. Step 6: Final answer
    x = 194.21

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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.