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Finding the Fourth Proportional to 257.97, 386.91 and 155.88

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Solution

The fourth proportional to 257.97, 386.91 and 155.88 is: 233.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.97 : 386.91 = 155.88 : x
  2. Step 2: Convert to fraction form
    257.97/386.91 = 155.88/x
  3. Step 3: Cross multiply
    257.97x = 386.91 × 155.88
  4. Step 4: Simplify right side
    257.97x = 60,311.53
  5. Step 5: Solve for x
    x = 60,311.53/257.97
  6. Step 6: Final answer
    x = 233.79

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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.