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Finding the Fourth Proportional to 258.50, 386.82 and 155.42

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Solution

The fourth proportional to 258.50, 386.82 and 155.42 is: 232.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.50 : 386.82 = 155.42 : x
  2. Step 2: Convert to fraction form
    258.50/386.82 = 155.42/x
  3. Step 3: Cross multiply
    258.50x = 386.82 × 155.42
  4. Step 4: Simplify right side
    258.50x = 60,119.56
  5. Step 5: Solve for x
    x = 60,119.56/258.50
  6. Step 6: Final answer
    x = 232.57

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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.