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Finding the Fourth Proportional to 141.97, 212.79 and 81.15

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Solution

The fourth proportional to 141.97, 212.79 and 81.15 is: 121.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.97 : 212.79 = 81.15 : x
  2. Step 2: Convert to fraction form
    141.97/212.79 = 81.15/x
  3. Step 3: Cross multiply
    141.97x = 212.79 × 81.15
  4. Step 4: Simplify right side
    141.97x = 17,267.91
  5. Step 5: Solve for x
    x = 17,267.91/141.97
  6. Step 6: Final answer
    x = 121.63

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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.