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Finding the Fourth Proportional to 162.29, 243.42 and 81.19

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Solution

The fourth proportional to 162.29, 243.42 and 81.19 is: 121.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.29 : 243.42 = 81.19 : x
  2. Step 2: Convert to fraction form
    162.29/243.42 = 81.19/x
  3. Step 3: Cross multiply
    162.29x = 243.42 × 81.19
  4. Step 4: Simplify right side
    162.29x = 19,763.27
  5. Step 5: Solve for x
    x = 19,763.27/162.29
  6. Step 6: Final answer
    x = 121.78

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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.