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Finding the Fourth Proportional to 139.27, 191.06 and 136.21

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Solution

The fourth proportional to 139.27, 191.06 and 136.21 is: 186.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.27 : 191.06 = 136.21 : x
  2. Step 2: Convert to fraction form
    139.27/191.06 = 136.21/x
  3. Step 3: Cross multiply
    139.27x = 191.06 × 136.21
  4. Step 4: Simplify right side
    139.27x = 26,024.28
  5. Step 5: Solve for x
    x = 26,024.28/139.27
  6. Step 6: Final answer
    x = 186.86

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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.