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Finding the Fourth Proportional to 219.74, 329.50 and 71.45

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Solution

The fourth proportional to 219.74, 329.50 and 71.45 is: 107.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.74 : 329.50 = 71.45 : x
  2. Step 2: Convert to fraction form
    219.74/329.50 = 71.45/x
  3. Step 3: Cross multiply
    219.74x = 329.50 × 71.45
  4. Step 4: Simplify right side
    219.74x = 23,542.18
  5. Step 5: Solve for x
    x = 23,542.18/219.74
  6. Step 6: Final answer
    x = 107.14

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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.