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Finding the Fourth Proportional to 139.46, 208.20 and 134.66

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Solution

The fourth proportional to 139.46, 208.20 and 134.66 is: 201.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.46 : 208.20 = 134.66 : x
  2. Step 2: Convert to fraction form
    139.46/208.20 = 134.66/x
  3. Step 3: Cross multiply
    139.46x = 208.20 × 134.66
  4. Step 4: Simplify right side
    139.46x = 28,036.21
  5. Step 5: Solve for x
    x = 28,036.21/139.46
  6. Step 6: Final answer
    x = 201.03

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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.