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Finding the Fourth Proportional to 80.53, 120.74 and 39.93

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Solution

The fourth proportional to 80.53, 120.74 and 39.93 is: 59.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.53 : 120.74 = 39.93 : x
  2. Step 2: Convert to fraction form
    80.53/120.74 = 39.93/x
  3. Step 3: Cross multiply
    80.53x = 120.74 × 39.93
  4. Step 4: Simplify right side
    80.53x = 4,821.15
  5. Step 5: Solve for x
    x = 4,821.15/80.53
  6. Step 6: Final answer
    x = 59.87

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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.