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Finding the Fourth Proportional to 139.66, 208.31 and 122.14

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Solution

The fourth proportional to 139.66, 208.31 and 122.14 is: 182.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.66 : 208.31 = 122.14 : x
  2. Step 2: Convert to fraction form
    139.66/208.31 = 122.14/x
  3. Step 3: Cross multiply
    139.66x = 208.31 × 122.14
  4. Step 4: Simplify right side
    139.66x = 25,442.63
  5. Step 5: Solve for x
    x = 25,442.63/139.66
  6. Step 6: Final answer
    x = 182.18

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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.