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Finding the Fourth Proportional to 139.11, 208.70 and 113.66

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Solution

The fourth proportional to 139.11, 208.70 and 113.66 is: 170.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.11 : 208.70 = 113.66 : x
  2. Step 2: Convert to fraction form
    139.11/208.70 = 113.66/x
  3. Step 3: Cross multiply
    139.11x = 208.70 × 113.66
  4. Step 4: Simplify right side
    139.11x = 23,719.23
  5. Step 5: Solve for x
    x = 23,719.23/139.11
  6. Step 6: Final answer
    x = 170.51

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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.