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Finding the Fourth Proportional to 98.97, 148.17 and 87.69

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Solution

The fourth proportional to 98.97, 148.17 and 87.69 is: 131.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.97 : 148.17 = 87.69 : x
  2. Step 2: Convert to fraction form
    98.97/148.17 = 87.69/x
  3. Step 3: Cross multiply
    98.97x = 148.17 × 87.69
  4. Step 4: Simplify right side
    98.97x = 12,993.03
  5. Step 5: Solve for x
    x = 12,993.03/98.97
  6. Step 6: Final answer
    x = 131.28

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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.