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Finding the Fourth Proportional to 107.97, 161.84 and 79.20

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Solution

The fourth proportional to 107.97, 161.84 and 79.20 is: 118.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.97 : 161.84 = 79.20 : x
  2. Step 2: Convert to fraction form
    107.97/161.84 = 79.20/x
  3. Step 3: Cross multiply
    107.97x = 161.84 × 79.20
  4. Step 4: Simplify right side
    107.97x = 12,817.93
  5. Step 5: Solve for x
    x = 12,817.93/107.97
  6. Step 6: Final answer
    x = 118.72

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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.