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Finding the Fourth Proportional to 39.71, 54.81 and 34.79

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Solution

The fourth proportional to 39.71, 54.81 and 34.79 is: 48.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.71 : 54.81 = 34.79 : x
  2. Step 2: Convert to fraction form
    39.71/54.81 = 34.79/x
  3. Step 3: Cross multiply
    39.71x = 54.81 × 34.79
  4. Step 4: Simplify right side
    39.71x = 1,906.57
  5. Step 5: Solve for x
    x = 1,906.57/39.71
  6. Step 6: Final answer
    x = 48.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.