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Finding the Fourth Proportional to 97.21, 146.49 and 80.47

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Solution

The fourth proportional to 97.21, 146.49 and 80.47 is: 121.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.21 : 146.49 = 80.47 : x
  2. Step 2: Convert to fraction form
    97.21/146.49 = 80.47/x
  3. Step 3: Cross multiply
    97.21x = 146.49 × 80.47
  4. Step 4: Simplify right side
    97.21x = 11,787.66
  5. Step 5: Solve for x
    x = 11,787.66/97.21
  6. Step 6: Final answer
    x = 121.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.