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Finding the Fourth Proportional to 82.44, 113.76 and 67.92

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Solution

The fourth proportional to 82.44, 113.76 and 67.92 is: 93.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.44 : 113.76 = 67.92 : x
  2. Step 2: Convert to fraction form
    82.44/113.76 = 67.92/x
  3. Step 3: Cross multiply
    82.44x = 113.76 × 67.92
  4. Step 4: Simplify right side
    82.44x = 7,726.58
  5. Step 5: Solve for x
    x = 7,726.58/82.44
  6. Step 6: Final answer
    x = 93.72

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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.