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Finding the Fourth Proportional to 219.80, 329.10 and 165.50

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Solution

The fourth proportional to 219.80, 329.10 and 165.50 is: 247.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.80 : 329.10 = 165.50 : x
  2. Step 2: Convert to fraction form
    219.80/329.10 = 165.50/x
  3. Step 3: Cross multiply
    219.80x = 329.10 × 165.50
  4. Step 4: Simplify right side
    219.80x = 54,466.05
  5. Step 5: Solve for x
    x = 54,466.05/219.80
  6. Step 6: Final answer
    x = 247.80

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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.