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Finding the Fourth Proportional to 139.70, 209.26 and 110.68

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Solution

The fourth proportional to 139.70, 209.26 and 110.68 is: 165.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.70 : 209.26 = 110.68 : x
  2. Step 2: Convert to fraction form
    139.70/209.26 = 110.68/x
  3. Step 3: Cross multiply
    139.70x = 209.26 × 110.68
  4. Step 4: Simplify right side
    139.70x = 23,160.90
  5. Step 5: Solve for x
    x = 23,160.90/139.70
  6. Step 6: Final answer
    x = 165.79

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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.