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Finding the Fourth Proportional to 161.09, 221.89 and 137.70

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Solution

The fourth proportional to 161.09, 221.89 and 137.70 is: 189.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.09 : 221.89 = 137.70 : x
  2. Step 2: Convert to fraction form
    161.09/221.89 = 137.70/x
  3. Step 3: Cross multiply
    161.09x = 221.89 × 137.70
  4. Step 4: Simplify right side
    161.09x = 30,554.17
  5. Step 5: Solve for x
    x = 30,554.17/161.09
  6. Step 6: Final answer
    x = 189.67

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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.