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Finding the Fourth Proportional to 79.58, 119.41 and 71.91

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Solution

The fourth proportional to 79.58, 119.41 and 71.91 is: 107.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.58 : 119.41 = 71.91 : x
  2. Step 2: Convert to fraction form
    79.58/119.41 = 71.91/x
  3. Step 3: Cross multiply
    79.58x = 119.41 × 71.91
  4. Step 4: Simplify right side
    79.58x = 8,586.59
  5. Step 5: Solve for x
    x = 8,586.59/79.58
  6. Step 6: Final answer
    x = 107.90

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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.