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Finding the Fourth Proportional to 162.96, 244.48 and 81.78

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Solution

The fourth proportional to 162.96, 244.48 and 81.78 is: 122.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.96 : 244.48 = 81.78 : x
  2. Step 2: Convert to fraction form
    162.96/244.48 = 81.78/x
  3. Step 3: Cross multiply
    162.96x = 244.48 × 81.78
  4. Step 4: Simplify right side
    162.96x = 19,993.57
  5. Step 5: Solve for x
    x = 19,993.57/162.96
  6. Step 6: Final answer
    x = 122.69

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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.