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Finding the Fourth Proportional to 161.65, 223 and 109.81

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Solution

The fourth proportional to 161.65, 223 and 109.81 is: 151.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.65 : 223 = 109.81 : x
  2. Step 2: Convert to fraction form
    161.65/223 = 109.81/x
  3. Step 3: Cross multiply
    161.65x = 223 × 109.81
  4. Step 4: Simplify right side
    161.65x = 24,487.63
  5. Step 5: Solve for x
    x = 24,487.63/161.65
  6. Step 6: Final answer
    x = 151.49

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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.