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Finding the Fourth Proportional to 257.88, 386.92 and 127.88

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Solution

The fourth proportional to 257.88, 386.92 and 127.88 is: 191.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.88 : 386.92 = 127.88 : x
  2. Step 2: Convert to fraction form
    257.88/386.92 = 127.88/x
  3. Step 3: Cross multiply
    257.88x = 386.92 × 127.88
  4. Step 4: Simplify right side
    257.88x = 49,479.01
  5. Step 5: Solve for x
    x = 49,479.01/257.88
  6. Step 6: Final answer
    x = 191.87

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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.