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Finding the Fourth Proportional to 257.75, 386.45 and 127.49

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Solution

The fourth proportional to 257.75, 386.45 and 127.49 is: 191.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.75 : 386.45 = 127.49 : x
  2. Step 2: Convert to fraction form
    257.75/386.45 = 127.49/x
  3. Step 3: Cross multiply
    257.75x = 386.45 × 127.49
  4. Step 4: Simplify right side
    257.75x = 49,265.94
  5. Step 5: Solve for x
    x = 49,265.94/257.75
  6. Step 6: Final answer
    x = 191.14

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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.