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Finding the Fourth Proportional to 137.86, 206.38 and 126.79

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Solution

The fourth proportional to 137.86, 206.38 and 126.79 is: 189.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.86 : 206.38 = 126.79 : x
  2. Step 2: Convert to fraction form
    137.86/206.38 = 126.79/x
  3. Step 3: Cross multiply
    137.86x = 206.38 × 126.79
  4. Step 4: Simplify right side
    137.86x = 26,166.92
  5. Step 5: Solve for x
    x = 26,166.92/137.86
  6. Step 6: Final answer
    x = 189.81

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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.