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Finding the Fourth Proportional to 142.92, 214.38 and 81.96

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Solution

The fourth proportional to 142.92, 214.38 and 81.96 is: 122.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.92 : 214.38 = 81.96 : x
  2. Step 2: Convert to fraction form
    142.92/214.38 = 81.96/x
  3. Step 3: Cross multiply
    142.92x = 214.38 × 81.96
  4. Step 4: Simplify right side
    142.92x = 17,570.58
  5. Step 5: Solve for x
    x = 17,570.58/142.92
  6. Step 6: Final answer
    x = 122.94

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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.