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Finding the Fourth Proportional to 39.28, 54.15 and 34.08

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Solution

The fourth proportional to 39.28, 54.15 and 34.08 is: 46.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.28 : 54.15 = 34.08 : x
  2. Step 2: Convert to fraction form
    39.28/54.15 = 34.08/x
  3. Step 3: Cross multiply
    39.28x = 54.15 × 34.08
  4. Step 4: Simplify right side
    39.28x = 1,844.99
  5. Step 5: Solve for x
    x = 1,844.99/39.28
  6. Step 6: Final answer
    x = 46.97

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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.