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Finding the Fourth Proportional to 80.70, 120.96 and 48.54

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Solution

The fourth proportional to 80.70, 120.96 and 48.54 is: 72.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.70 : 120.96 = 48.54 : x
  2. Step 2: Convert to fraction form
    80.70/120.96 = 48.54/x
  3. Step 3: Cross multiply
    80.70x = 120.96 × 48.54
  4. Step 4: Simplify right side
    80.70x = 5,871.40
  5. Step 5: Solve for x
    x = 5,871.40/80.70
  6. Step 6: Final answer
    x = 72.76

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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.