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Finding the Fourth Proportional to 139.94, 208.67 and 136.29

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Solution

The fourth proportional to 139.94, 208.67 and 136.29 is: 203.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.94 : 208.67 = 136.29 : x
  2. Step 2: Convert to fraction form
    139.94/208.67 = 136.29/x
  3. Step 3: Cross multiply
    139.94x = 208.67 × 136.29
  4. Step 4: Simplify right side
    139.94x = 28,439.63
  5. Step 5: Solve for x
    x = 28,439.63/139.94
  6. Step 6: Final answer
    x = 203.23

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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.