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Finding the Fourth Proportional to 67.92, 101.40 and 61.84

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Solution

The fourth proportional to 67.92, 101.40 and 61.84 is: 92.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.92 : 101.40 = 61.84 : x
  2. Step 2: Convert to fraction form
    67.92/101.40 = 61.84/x
  3. Step 3: Cross multiply
    67.92x = 101.40 × 61.84
  4. Step 4: Simplify right side
    67.92x = 6,270.58
  5. Step 5: Solve for x
    x = 6,270.58/67.92
  6. Step 6: Final answer
    x = 92.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.