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Finding the Fourth Proportional to 79.85, 119.78 and 43.27

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Solution

The fourth proportional to 79.85, 119.78 and 43.27 is: 64.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.85 : 119.78 = 43.27 : x
  2. Step 2: Convert to fraction form
    79.85/119.78 = 43.27/x
  3. Step 3: Cross multiply
    79.85x = 119.78 × 43.27
  4. Step 4: Simplify right side
    79.85x = 5,182.88
  5. Step 5: Solve for x
    x = 5,182.88/79.85
  6. Step 6: Final answer
    x = 64.91

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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.