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Finding the Fourth Proportional to 53.92, 80.82 and 38.72

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Solution

The fourth proportional to 53.92, 80.82 and 38.72 is: 58.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.92 : 80.82 = 38.72 : x
  2. Step 2: Convert to fraction form
    53.92/80.82 = 38.72/x
  3. Step 3: Cross multiply
    53.92x = 80.82 × 38.72
  4. Step 4: Simplify right side
    53.92x = 3,129.35
  5. Step 5: Solve for x
    x = 3,129.35/53.92
  6. Step 6: Final answer
    x = 58.04

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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.