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Finding the Fourth Proportional to 80.53, 120.79 and 19.66

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Solution

The fourth proportional to 80.53, 120.79 and 19.66 is: 29.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.53 : 120.79 = 19.66 : x
  2. Step 2: Convert to fraction form
    80.53/120.79 = 19.66/x
  3. Step 3: Cross multiply
    80.53x = 120.79 × 19.66
  4. Step 4: Simplify right side
    80.53x = 2,374.30
  5. Step 5: Solve for x
    x = 2,374.30/80.53
  6. Step 6: Final answer
    x = 29.49

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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.