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Finding the Fourth Proportional to 67.92, 93.72 and 38.80

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Solution

The fourth proportional to 67.92, 93.72 and 38.80 is: 53.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.92 : 93.72 = 38.80 : x
  2. Step 2: Convert to fraction form
    67.92/93.72 = 38.80/x
  3. Step 3: Cross multiply
    67.92x = 93.72 × 38.80
  4. Step 4: Simplify right side
    67.92x = 3,636.34
  5. Step 5: Solve for x
    x = 3,636.34/67.92
  6. Step 6: Final answer
    x = 53.54

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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.