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Finding the Fourth Proportional to 139.39, 191.90 and 118.67

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Solution

The fourth proportional to 139.39, 191.90 and 118.67 is: 163.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.39 : 191.90 = 118.67 : x
  2. Step 2: Convert to fraction form
    139.39/191.90 = 118.67/x
  3. Step 3: Cross multiply
    139.39x = 191.90 × 118.67
  4. Step 4: Simplify right side
    139.39x = 22,772.11
  5. Step 5: Solve for x
    x = 22,772.11/139.39
  6. Step 6: Final answer
    x = 163.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.