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Finding the Fourth Proportional to 162.35, 243.38 and 81.09

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Solution

The fourth proportional to 162.35, 243.38 and 81.09 is: 121.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.35 : 243.38 = 81.09 : x
  2. Step 2: Convert to fraction form
    162.35/243.38 = 81.09/x
  3. Step 3: Cross multiply
    162.35x = 243.38 × 81.09
  4. Step 4: Simplify right side
    162.35x = 19,735.28
  5. Step 5: Solve for x
    x = 19,735.28/162.35
  6. Step 6: Final answer
    x = 121.56

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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.