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Finding the Fourth Proportional to 95.20, 142.72 and 67.79

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Solution

The fourth proportional to 95.20, 142.72 and 67.79 is: 101.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.20 : 142.72 = 67.79 : x
  2. Step 2: Convert to fraction form
    95.20/142.72 = 67.79/x
  3. Step 3: Cross multiply
    95.20x = 142.72 × 67.79
  4. Step 4: Simplify right side
    95.20x = 9,675.18
  5. Step 5: Solve for x
    x = 9,675.18/95.20
  6. Step 6: Final answer
    x = 101.63

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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.