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Finding the Fourth Proportional to 137.57, 206.40 and 108.70

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Solution

The fourth proportional to 137.57, 206.40 and 108.70 is: 163.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.57 : 206.40 = 108.70 : x
  2. Step 2: Convert to fraction form
    137.57/206.40 = 108.70/x
  3. Step 3: Cross multiply
    137.57x = 206.40 × 108.70
  4. Step 4: Simplify right side
    137.57x = 22,435.68
  5. Step 5: Solve for x
    x = 22,435.68/137.57
  6. Step 6: Final answer
    x = 163.09

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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.