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Finding the Fourth Proportional to 139.12, 190.76 and 131.56

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Solution

The fourth proportional to 139.12, 190.76 and 131.56 is: 180.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.12 : 190.76 = 131.56 : x
  2. Step 2: Convert to fraction form
    139.12/190.76 = 131.56/x
  3. Step 3: Cross multiply
    139.12x = 190.76 × 131.56
  4. Step 4: Simplify right side
    139.12x = 25,096.39
  5. Step 5: Solve for x
    x = 25,096.39/139.12
  6. Step 6: Final answer
    x = 180.39

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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.