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Finding the Fourth Proportional to 141.81, 212.42 and 80.91

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Solution

The fourth proportional to 141.81, 212.42 and 80.91 is: 121.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.81 : 212.42 = 80.91 : x
  2. Step 2: Convert to fraction form
    141.81/212.42 = 80.91/x
  3. Step 3: Cross multiply
    141.81x = 212.42 × 80.91
  4. Step 4: Simplify right side
    141.81x = 17,186.50
  5. Step 5: Solve for x
    x = 17,186.50/141.81
  6. Step 6: Final answer
    x = 121.19

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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.