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Finding the Fourth Proportional to 162.46, 243.78 and 81.28

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Solution

The fourth proportional to 162.46, 243.78 and 81.28 is: 121.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.46 : 243.78 = 81.28 : x
  2. Step 2: Convert to fraction form
    162.46/243.78 = 81.28/x
  3. Step 3: Cross multiply
    162.46x = 243.78 × 81.28
  4. Step 4: Simplify right side
    162.46x = 19,814.44
  5. Step 5: Solve for x
    x = 19,814.44/162.46
  6. Step 6: Final answer
    x = 121.97

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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.