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Finding the Fourth Proportional to 161.08, 221.82 and 111.87

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Solution

The fourth proportional to 161.08, 221.82 and 111.87 is: 154.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.08 : 221.82 = 111.87 : x
  2. Step 2: Convert to fraction form
    161.08/221.82 = 111.87/x
  3. Step 3: Cross multiply
    161.08x = 221.82 × 111.87
  4. Step 4: Simplify right side
    161.08x = 24,813.89
  5. Step 5: Solve for x
    x = 24,813.89/161.08
  6. Step 6: Final answer
    x = 154.05

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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.