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Finding the Fourth Proportional to 160.12, 221.11 and 138.08

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Solution

The fourth proportional to 160.12, 221.11 and 138.08 is: 190.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.12 : 221.11 = 138.08 : x
  2. Step 2: Convert to fraction form
    160.12/221.11 = 138.08/x
  3. Step 3: Cross multiply
    160.12x = 221.11 × 138.08
  4. Step 4: Simplify right side
    160.12x = 30,530.87
  5. Step 5: Solve for x
    x = 30,530.87/160.12
  6. Step 6: Final answer
    x = 190.67

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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.