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Finding the Fourth Proportional to 139.19, 208.68 and 108.67

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Solution

The fourth proportional to 139.19, 208.68 and 108.67 is: 162.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.19 : 208.68 = 108.67 : x
  2. Step 2: Convert to fraction form
    139.19/208.68 = 108.67/x
  3. Step 3: Cross multiply
    139.19x = 208.68 × 108.67
  4. Step 4: Simplify right side
    139.19x = 22,676.13
  5. Step 5: Solve for x
    x = 22,676.13/139.19
  6. Step 6: Final answer
    x = 162.91

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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.