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Finding the Fourth Proportional to 139.13, 191.99 and 80.94

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Solution

The fourth proportional to 139.13, 191.99 and 80.94 is: 111.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.13 : 191.99 = 80.94 : x
  2. Step 2: Convert to fraction form
    139.13/191.99 = 80.94/x
  3. Step 3: Cross multiply
    139.13x = 191.99 × 80.94
  4. Step 4: Simplify right side
    139.13x = 15,539.87
  5. Step 5: Solve for x
    x = 15,539.87/139.13
  6. Step 6: Final answer
    x = 111.70

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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.