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Finding the Fourth Proportional to 81.44, 121.92 and 49.28

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Solution

The fourth proportional to 81.44, 121.92 and 49.28 is: 73.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.44 : 121.92 = 49.28 : x
  2. Step 2: Convert to fraction form
    81.44/121.92 = 49.28/x
  3. Step 3: Cross multiply
    81.44x = 121.92 × 49.28
  4. Step 4: Simplify right side
    81.44x = 6,008.22
  5. Step 5: Solve for x
    x = 6,008.22/81.44
  6. Step 6: Final answer
    x = 73.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.