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Finding the Fourth Proportional to 219.64, 329.73 and 138.64

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Solution

The fourth proportional to 219.64, 329.73 and 138.64 is: 208.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.64 : 329.73 = 138.64 : x
  2. Step 2: Convert to fraction form
    219.64/329.73 = 138.64/x
  3. Step 3: Cross multiply
    219.64x = 329.73 × 138.64
  4. Step 4: Simplify right side
    219.64x = 45,713.77
  5. Step 5: Solve for x
    x = 45,713.77/219.64
  6. Step 6: Final answer
    x = 208.13

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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.