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Finding the Fourth Proportional to 107.21, 161.04 and 76.97

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Solution

The fourth proportional to 107.21, 161.04 and 76.97 is: 115.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.21 : 161.04 = 76.97 : x
  2. Step 2: Convert to fraction form
    107.21/161.04 = 76.97/x
  3. Step 3: Cross multiply
    107.21x = 161.04 × 76.97
  4. Step 4: Simplify right side
    107.21x = 12,394.06
  5. Step 5: Solve for x
    x = 12,394.06/107.21
  6. Step 6: Final answer
    x = 115.61

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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.