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Finding the Fourth Proportional to 142.38, 196.50 and 80.21

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Solution

The fourth proportional to 142.38, 196.50 and 80.21 is: 110.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.38 : 196.50 = 80.21 : x
  2. Step 2: Convert to fraction form
    142.38/196.50 = 80.21/x
  3. Step 3: Cross multiply
    142.38x = 196.50 × 80.21
  4. Step 4: Simplify right side
    142.38x = 15,760.28
  5. Step 5: Solve for x
    x = 15,760.28/142.38
  6. Step 6: Final answer
    x = 110.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.