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Finding the Fourth Proportional to 80.03, 109.71 and 79.90

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Solution

The fourth proportional to 80.03, 109.71 and 79.90 is: 109.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.03 : 109.71 = 79.90 : x
  2. Step 2: Convert to fraction form
    80.03/109.71 = 79.90/x
  3. Step 3: Cross multiply
    80.03x = 109.71 × 79.90
  4. Step 4: Simplify right side
    80.03x = 8,765.55
  5. Step 5: Solve for x
    x = 8,765.55/80.03
  6. Step 6: Final answer
    x = 109.52

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.