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Finding the Fourth Proportional to 257.38, 386.34 and 251.58

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Solution

The fourth proportional to 257.38, 386.34 and 251.58 is: 377.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.38 : 386.34 = 251.58 : x
  2. Step 2: Convert to fraction form
    257.38/386.34 = 251.58/x
  3. Step 3: Cross multiply
    257.38x = 386.34 × 251.58
  4. Step 4: Simplify right side
    257.38x = 97,195.42
  5. Step 5: Solve for x
    x = 97,195.42/257.38
  6. Step 6: Final answer
    x = 377.63

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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.