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Finding the Fourth Proportional to 219.87, 329.94 and 138.75

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Solution

The fourth proportional to 219.87, 329.94 and 138.75 is: 208.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.87 : 329.94 = 138.75 : x
  2. Step 2: Convert to fraction form
    219.87/329.94 = 138.75/x
  3. Step 3: Cross multiply
    219.87x = 329.94 × 138.75
  4. Step 4: Simplify right side
    219.87x = 45,779.18
  5. Step 5: Solve for x
    x = 45,779.18/219.87
  6. Step 6: Final answer
    x = 208.21

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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.