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Finding the Fourth Proportional to 257.60, 386.18 and 129.44

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Solution

The fourth proportional to 257.60, 386.18 and 129.44 is: 194.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.60 : 386.18 = 129.44 : x
  2. Step 2: Convert to fraction form
    257.60/386.18 = 129.44/x
  3. Step 3: Cross multiply
    257.60x = 386.18 × 129.44
  4. Step 4: Simplify right side
    257.60x = 49,987.14
  5. Step 5: Solve for x
    x = 49,987.14/257.60
  6. Step 6: Final answer
    x = 194.05

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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.