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Finding the Fourth Proportional to 67.20, 92.71 and 38.08

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Solution

The fourth proportional to 67.20, 92.71 and 38.08 is: 52.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.20 : 92.71 = 38.08 : x
  2. Step 2: Convert to fraction form
    67.20/92.71 = 38.08/x
  3. Step 3: Cross multiply
    67.20x = 92.71 × 38.08
  4. Step 4: Simplify right side
    67.20x = 3,530.40
  5. Step 5: Solve for x
    x = 3,530.40/67.20
  6. Step 6: Final answer
    x = 52.54

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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.