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Finding the Fourth Proportional to 79.91, 119.90 and 57.23

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Solution

The fourth proportional to 79.91, 119.90 and 57.23 is: 85.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.91 : 119.90 = 57.23 : x
  2. Step 2: Convert to fraction form
    79.91/119.90 = 57.23/x
  3. Step 3: Cross multiply
    79.91x = 119.90 × 57.23
  4. Step 4: Simplify right side
    79.91x = 6,861.88
  5. Step 5: Solve for x
    x = 6,861.88/79.91
  6. Step 6: Final answer
    x = 85.87

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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.