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Finding the Fourth Proportional to 98.97, 148.42 and 81.01

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Solution

The fourth proportional to 98.97, 148.42 and 81.01 is: 121.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.97 : 148.42 = 81.01 : x
  2. Step 2: Convert to fraction form
    98.97/148.42 = 81.01/x
  3. Step 3: Cross multiply
    98.97x = 148.42 × 81.01
  4. Step 4: Simplify right side
    98.97x = 12,023.50
  5. Step 5: Solve for x
    x = 12,023.50/98.97
  6. Step 6: Final answer
    x = 121.49

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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.