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Finding the Fourth Proportional to 142.18, 196.21 and 83.18

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Solution

The fourth proportional to 142.18, 196.21 and 83.18 is: 114.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.18 : 196.21 = 83.18 : x
  2. Step 2: Convert to fraction form
    142.18/196.21 = 83.18/x
  3. Step 3: Cross multiply
    142.18x = 196.21 × 83.18
  4. Step 4: Simplify right side
    142.18x = 16,320.75
  5. Step 5: Solve for x
    x = 16,320.75/142.18
  6. Step 6: Final answer
    x = 114.79

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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.