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Finding the Fourth Proportional to 79.96, 119.91 and 71.41

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Solution

The fourth proportional to 79.96, 119.91 and 71.41 is: 107.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.96 : 119.91 = 71.41 : x
  2. Step 2: Convert to fraction form
    79.96/119.91 = 71.41/x
  3. Step 3: Cross multiply
    79.96x = 119.91 × 71.41
  4. Step 4: Simplify right side
    79.96x = 8,562.77
  5. Step 5: Solve for x
    x = 8,562.77/79.96
  6. Step 6: Final answer
    x = 107.09

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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.