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Finding the Fourth Proportional to 257.53, 386.39 and 120.62

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Solution

The fourth proportional to 257.53, 386.39 and 120.62 is: 180.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.53 : 386.39 = 120.62 : x
  2. Step 2: Convert to fraction form
    257.53/386.39 = 120.62/x
  3. Step 3: Cross multiply
    257.53x = 386.39 × 120.62
  4. Step 4: Simplify right side
    257.53x = 46,604.73
  5. Step 5: Solve for x
    x = 46,604.73/257.53
  6. Step 6: Final answer
    x = 180.97

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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.