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Finding the Fourth Proportional to 39.92, 59.94 and 33.20

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Solution

The fourth proportional to 39.92, 59.94 and 33.20 is: 49.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.92 : 59.94 = 33.20 : x
  2. Step 2: Convert to fraction form
    39.92/59.94 = 33.20/x
  3. Step 3: Cross multiply
    39.92x = 59.94 × 33.20
  4. Step 4: Simplify right side
    39.92x = 1,990.16
  5. Step 5: Solve for x
    x = 1,990.16/39.92
  6. Step 6: Final answer
    x = 49.86

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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.