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Finding the Fourth Proportional to 257.96, 386.82 and 129.56

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Solution

The fourth proportional to 257.96, 386.82 and 129.56 is: 194.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.96 : 386.82 = 129.56 : x
  2. Step 2: Convert to fraction form
    257.96/386.82 = 129.56/x
  3. Step 3: Cross multiply
    257.96x = 386.82 × 129.56
  4. Step 4: Simplify right side
    257.96x = 50,116.40
  5. Step 5: Solve for x
    x = 50,116.40/257.96
  6. Step 6: Final answer
    x = 194.28

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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.