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Finding the Fourth Proportional to 161.72, 223.10 and 109.20

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Solution

The fourth proportional to 161.72, 223.10 and 109.20 is: 150.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.72 : 223.10 = 109.20 : x
  2. Step 2: Convert to fraction form
    161.72/223.10 = 109.20/x
  3. Step 3: Cross multiply
    161.72x = 223.10 × 109.20
  4. Step 4: Simplify right side
    161.72x = 24,362.79
  5. Step 5: Solve for x
    x = 24,362.79/161.72
  6. Step 6: Final answer
    x = 150.65

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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.