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Finding the Fourth Proportional to 138.87, 191.75 and 117.09

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Solution

The fourth proportional to 138.87, 191.75 and 117.09 is: 161.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.87 : 191.75 = 117.09 : x
  2. Step 2: Convert to fraction form
    138.87/191.75 = 117.09/x
  3. Step 3: Cross multiply
    138.87x = 191.75 × 117.09
  4. Step 4: Simplify right side
    138.87x = 22,451.42
  5. Step 5: Solve for x
    x = 22,451.42/138.87
  6. Step 6: Final answer
    x = 161.67

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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.