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Finding the Fourth Proportional to 39.39, 54.35 and 25.55

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Solution

The fourth proportional to 39.39, 54.35 and 25.55 is: 35.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.39 : 54.35 = 25.55 : x
  2. Step 2: Convert to fraction form
    39.39/54.35 = 25.55/x
  3. Step 3: Cross multiply
    39.39x = 54.35 × 25.55
  4. Step 4: Simplify right side
    39.39x = 1,388.54
  5. Step 5: Solve for x
    x = 1,388.54/39.39
  6. Step 6: Final answer
    x = 35.25

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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.