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Finding the Fourth Proportional to 139.25, 209.05 and 113.74

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Solution

The fourth proportional to 139.25, 209.05 and 113.74 is: 170.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.25 : 209.05 = 113.74 : x
  2. Step 2: Convert to fraction form
    139.25/209.05 = 113.74/x
  3. Step 3: Cross multiply
    139.25x = 209.05 × 113.74
  4. Step 4: Simplify right side
    139.25x = 23,776.54
  5. Step 5: Solve for x
    x = 23,776.54/139.25
  6. Step 6: Final answer
    x = 170.74

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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.