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Finding the Fourth Proportional to 39.75, 54.79 and 36.48

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Solution

The fourth proportional to 39.75, 54.79 and 36.48 is: 50.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.75 : 54.79 = 36.48 : x
  2. Step 2: Convert to fraction form
    39.75/54.79 = 36.48/x
  3. Step 3: Cross multiply
    39.75x = 54.79 × 36.48
  4. Step 4: Simplify right side
    39.75x = 1,998.74
  5. Step 5: Solve for x
    x = 1,998.74/39.75
  6. Step 6: Final answer
    x = 50.28

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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.