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Finding the Fourth Proportional to 219.56, 329.40 and 115.45

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Solution

The fourth proportional to 219.56, 329.40 and 115.45 is: 173.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.56 : 329.40 = 115.45 : x
  2. Step 2: Convert to fraction form
    219.56/329.40 = 115.45/x
  3. Step 3: Cross multiply
    219.56x = 329.40 × 115.45
  4. Step 4: Simplify right side
    219.56x = 38,029.23
  5. Step 5: Solve for x
    x = 38,029.23/219.56
  6. Step 6: Final answer
    x = 173.21

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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.