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Finding the Fourth Proportional to 107.75, 161.51 and 80.82

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Solution

The fourth proportional to 107.75, 161.51 and 80.82 is: 121.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.75 : 161.51 = 80.82 : x
  2. Step 2: Convert to fraction form
    107.75/161.51 = 80.82/x
  3. Step 3: Cross multiply
    107.75x = 161.51 × 80.82
  4. Step 4: Simplify right side
    107.75x = 13,053.24
  5. Step 5: Solve for x
    x = 13,053.24/107.75
  6. Step 6: Final answer
    x = 121.14

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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.