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Finding the Fourth Proportional to 161.10, 222.15 and 111.96

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Solution

The fourth proportional to 161.10, 222.15 and 111.96 is: 154.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.10 : 222.15 = 111.96 : x
  2. Step 2: Convert to fraction form
    161.10/222.15 = 111.96/x
  3. Step 3: Cross multiply
    161.10x = 222.15 × 111.96
  4. Step 4: Simplify right side
    161.10x = 24,871.91
  5. Step 5: Solve for x
    x = 24,871.91/161.10
  6. Step 6: Final answer
    x = 154.39

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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.