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Finding the Fourth Proportional to 257.43, 386.20 and 95.11

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Solution

The fourth proportional to 257.43, 386.20 and 95.11 is: 142.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.43 : 386.20 = 95.11 : x
  2. Step 2: Convert to fraction form
    257.43/386.20 = 95.11/x
  3. Step 3: Cross multiply
    257.43x = 386.20 × 95.11
  4. Step 4: Simplify right side
    257.43x = 36,730.82
  5. Step 5: Solve for x
    x = 36,730.82/257.43
  6. Step 6: Final answer
    x = 142.68

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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.