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Finding the Fourth Proportional to 39.75, 54.89 and 34.26

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Solution

The fourth proportional to 39.75, 54.89 and 34.26 is: 47.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.75 : 54.89 = 34.26 : x
  2. Step 2: Convert to fraction form
    39.75/54.89 = 34.26/x
  3. Step 3: Cross multiply
    39.75x = 54.89 × 34.26
  4. Step 4: Simplify right side
    39.75x = 1,880.53
  5. Step 5: Solve for x
    x = 1,880.53/39.75
  6. Step 6: Final answer
    x = 47.31

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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.