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Finding the Fourth Proportional to 80.67, 120.71 and 79.47

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Solution

The fourth proportional to 80.67, 120.71 and 79.47 is: 118.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.67 : 120.71 = 79.47 : x
  2. Step 2: Convert to fraction form
    80.67/120.71 = 79.47/x
  3. Step 3: Cross multiply
    80.67x = 120.71 × 79.47
  4. Step 4: Simplify right side
    80.67x = 9,592.43
  5. Step 5: Solve for x
    x = 9,592.43/80.67
  6. Step 6: Final answer
    x = 118.91

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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.