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Finding the Fourth Proportional to 139.97, 208.90 and 136.33

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Solution

The fourth proportional to 139.97, 208.90 and 136.33 is: 203.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.97 : 208.90 = 136.33 : x
  2. Step 2: Convert to fraction form
    139.97/208.90 = 136.33/x
  3. Step 3: Cross multiply
    139.97x = 208.90 × 136.33
  4. Step 4: Simplify right side
    139.97x = 28,479.79
  5. Step 5: Solve for x
    x = 28,479.79/139.97
  6. Step 6: Final answer
    x = 203.46

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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.