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Finding the Fourth Proportional to 67.12, 92.61 and 39.48

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Solution

The fourth proportional to 67.12, 92.61 and 39.48 is: 54.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.12 : 92.61 = 39.48 : x
  2. Step 2: Convert to fraction form
    67.12/92.61 = 39.48/x
  3. Step 3: Cross multiply
    67.12x = 92.61 × 39.48
  4. Step 4: Simplify right side
    67.12x = 3,656.24
  5. Step 5: Solve for x
    x = 3,656.24/67.12
  6. Step 6: Final answer
    x = 54.48

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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.