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Finding the Fourth Proportional to 139.71, 209.84 and 136.47

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Solution

The fourth proportional to 139.71, 209.84 and 136.47 is: 204.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.71 : 209.84 = 136.47 : x
  2. Step 2: Convert to fraction form
    139.71/209.84 = 136.47/x
  3. Step 3: Cross multiply
    139.71x = 209.84 × 136.47
  4. Step 4: Simplify right side
    139.71x = 28,636.18
  5. Step 5: Solve for x
    x = 28,636.18/139.71
  6. Step 6: Final answer
    x = 204.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.