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Finding the Fourth Proportional to 39.32, 54.15 and 36.80

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Solution

The fourth proportional to 39.32, 54.15 and 36.80 is: 50.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.32 : 54.15 = 36.80 : x
  2. Step 2: Convert to fraction form
    39.32/54.15 = 36.80/x
  3. Step 3: Cross multiply
    39.32x = 54.15 × 36.80
  4. Step 4: Simplify right side
    39.32x = 1,992.45
  5. Step 5: Solve for x
    x = 1,992.45/39.32
  6. Step 6: Final answer
    x = 50.68

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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.