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Finding the Fourth Proportional to 219.68, 329.44 and 142.40

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Solution

The fourth proportional to 219.68, 329.44 and 142.40 is: 213.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.68 : 329.44 = 142.40 : x
  2. Step 2: Convert to fraction form
    219.68/329.44 = 142.40/x
  3. Step 3: Cross multiply
    219.68x = 329.44 × 142.40
  4. Step 4: Simplify right side
    219.68x = 46,912.26
  5. Step 5: Solve for x
    x = 46,912.26/219.68
  6. Step 6: Final answer
    x = 213.55

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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.