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Finding the Fourth Proportional to 80.72, 120.10 and 80.46

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Solution

The fourth proportional to 80.72, 120.10 and 80.46 is: 119.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.72 : 120.10 = 80.46 : x
  2. Step 2: Convert to fraction form
    80.72/120.10 = 80.46/x
  3. Step 3: Cross multiply
    80.72x = 120.10 × 80.46
  4. Step 4: Simplify right side
    80.72x = 9,663.25
  5. Step 5: Solve for x
    x = 9,663.25/80.72
  6. Step 6: Final answer
    x = 119.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.