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Finding the Fourth Proportional to 139.28, 190.91 and 139.05

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Solution

The fourth proportional to 139.28, 190.91 and 139.05 is: 190.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.28 : 190.91 = 139.05 : x
  2. Step 2: Convert to fraction form
    139.28/190.91 = 139.05/x
  3. Step 3: Cross multiply
    139.28x = 190.91 × 139.05
  4. Step 4: Simplify right side
    139.28x = 26,546.04
  5. Step 5: Solve for x
    x = 26,546.04/139.28
  6. Step 6: Final answer
    x = 190.59

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.