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Finding the Fourth Proportional to 139.11, 190.82 and 131.23

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Solution

The fourth proportional to 139.11, 190.82 and 131.23 is: 180.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.11 : 190.82 = 131.23 : x
  2. Step 2: Convert to fraction form
    139.11/190.82 = 131.23/x
  3. Step 3: Cross multiply
    139.11x = 190.82 × 131.23
  4. Step 4: Simplify right side
    139.11x = 25,041.31
  5. Step 5: Solve for x
    x = 25,041.31/139.11
  6. Step 6: Final answer
    x = 180.01

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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.