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Finding the Fourth Proportional to 98.69, 148.16 and 80.73

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Solution

The fourth proportional to 98.69, 148.16 and 80.73 is: 121.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.69 : 148.16 = 80.73 : x
  2. Step 2: Convert to fraction form
    98.69/148.16 = 80.73/x
  3. Step 3: Cross multiply
    98.69x = 148.16 × 80.73
  4. Step 4: Simplify right side
    98.69x = 11,961.16
  5. Step 5: Solve for x
    x = 11,961.16/98.69
  6. Step 6: Final answer
    x = 121.21

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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.