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Finding the Fourth Proportional to 139.20, 191.92 and 102.24

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Solution

The fourth proportional to 139.20, 191.92 and 102.24 is: 140.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.20 : 191.92 = 102.24 : x
  2. Step 2: Convert to fraction form
    139.20/191.92 = 102.24/x
  3. Step 3: Cross multiply
    139.20x = 191.92 × 102.24
  4. Step 4: Simplify right side
    139.20x = 19,621.90
  5. Step 5: Solve for x
    x = 19,621.90/139.20
  6. Step 6: Final answer
    x = 140.96

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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.