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Finding the Fourth Proportional to 257.15, 385.47 and 126.96

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Solution

The fourth proportional to 257.15, 385.47 and 126.96 is: 190.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.15 : 385.47 = 126.96 : x
  2. Step 2: Convert to fraction form
    257.15/385.47 = 126.96/x
  3. Step 3: Cross multiply
    257.15x = 385.47 × 126.96
  4. Step 4: Simplify right side
    257.15x = 48,939.27
  5. Step 5: Solve for x
    x = 48,939.27/257.15
  6. Step 6: Final answer
    x = 190.31

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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.