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Finding the Fourth Proportional to 142.07, 196.08 and 83.89

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Solution

The fourth proportional to 142.07, 196.08 and 83.89 is: 115.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.07 : 196.08 = 83.89 : x
  2. Step 2: Convert to fraction form
    142.07/196.08 = 83.89/x
  3. Step 3: Cross multiply
    142.07x = 196.08 × 83.89
  4. Step 4: Simplify right side
    142.07x = 16,449.15
  5. Step 5: Solve for x
    x = 16,449.15/142.07
  6. Step 6: Final answer
    x = 115.78

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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.