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Finding the Fourth Proportional to 161.12, 222.40 and 122.40

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Solution

The fourth proportional to 161.12, 222.40 and 122.40 is: 168.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.12 : 222.40 = 122.40 : x
  2. Step 2: Convert to fraction form
    161.12/222.40 = 122.40/x
  3. Step 3: Cross multiply
    161.12x = 222.40 × 122.40
  4. Step 4: Simplify right side
    161.12x = 27,221.76
  5. Step 5: Solve for x
    x = 27,221.76/161.12
  6. Step 6: Final answer
    x = 168.95

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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.