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Finding the Fourth Proportional to 36.72, 54.96 and 31.92

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Solution

The fourth proportional to 36.72, 54.96 and 31.92 is: 47.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.72 : 54.96 = 31.92 : x
  2. Step 2: Convert to fraction form
    36.72/54.96 = 31.92/x
  3. Step 3: Cross multiply
    36.72x = 54.96 × 31.92
  4. Step 4: Simplify right side
    36.72x = 1,754.32
  5. Step 5: Solve for x
    x = 1,754.32/36.72
  6. Step 6: Final answer
    x = 47.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.