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Finding the Fourth Proportional to 39.72, 54.77 and 28.04

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Solution

The fourth proportional to 39.72, 54.77 and 28.04 is: 38.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.72 : 54.77 = 28.04 : x
  2. Step 2: Convert to fraction form
    39.72/54.77 = 28.04/x
  3. Step 3: Cross multiply
    39.72x = 54.77 × 28.04
  4. Step 4: Simplify right side
    39.72x = 1,535.96
  5. Step 5: Solve for x
    x = 1,535.96/39.72
  6. Step 6: Final answer
    x = 38.67

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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.