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Finding the Fourth Proportional to 139.47, 193.30 and 136.88

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Solution

The fourth proportional to 139.47, 193.30 and 136.88 is: 189.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.47 : 193.30 = 136.88 : x
  2. Step 2: Convert to fraction form
    139.47/193.30 = 136.88/x
  3. Step 3: Cross multiply
    139.47x = 193.30 × 136.88
  4. Step 4: Simplify right side
    139.47x = 26,458.96
  5. Step 5: Solve for x
    x = 26,458.96/139.47
  6. Step 6: Final answer
    x = 189.71

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.