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Finding the Fourth Proportional to 438.72, 658.42 and 165

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Solution

The fourth proportional to 438.72, 658.42 and 165 is: 247.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.72 : 658.42 = 165 : x
  2. Step 2: Convert to fraction form
    438.72/658.42 = 165/x
  3. Step 3: Cross multiply
    438.72x = 658.42 × 165
  4. Step 4: Simplify right side
    438.72x = 108,639.30
  5. Step 5: Solve for x
    x = 108,639.30/438.72
  6. Step 6: Final answer
    x = 247.63

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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.