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Finding the Fourth Proportional to 139.87, 208.49 and 131.14

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Solution

The fourth proportional to 139.87, 208.49 and 131.14 is: 195.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.87 : 208.49 = 131.14 : x
  2. Step 2: Convert to fraction form
    139.87/208.49 = 131.14/x
  3. Step 3: Cross multiply
    139.87x = 208.49 × 131.14
  4. Step 4: Simplify right side
    139.87x = 27,341.38
  5. Step 5: Solve for x
    x = 27,341.38/139.87
  6. Step 6: Final answer
    x = 195.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.