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Finding the Fourth Proportional to 39.38, 58.80 and 33.60

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Solution

The fourth proportional to 39.38, 58.80 and 33.60 is: 50.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.38 : 58.80 = 33.60 : x
  2. Step 2: Convert to fraction form
    39.38/58.80 = 33.60/x
  3. Step 3: Cross multiply
    39.38x = 58.80 × 33.60
  4. Step 4: Simplify right side
    39.38x = 1,976.03
  5. Step 5: Solve for x
    x = 1,976.03/39.38
  6. Step 6: Final answer
    x = 50.18

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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.