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Finding the Fourth Proportional to 146.25, 219.46 and 81.31

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Solution

The fourth proportional to 146.25, 219.46 and 81.31 is: 122.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.25 : 219.46 = 81.31 : x
  2. Step 2: Convert to fraction form
    146.25/219.46 = 81.31/x
  3. Step 3: Cross multiply
    146.25x = 219.46 × 81.31
  4. Step 4: Simplify right side
    146.25x = 17,843.54
  5. Step 5: Solve for x
    x = 17,843.54/146.25
  6. Step 6: Final answer
    x = 122.01

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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.