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Finding the Fourth Proportional to 161.89, 223.21 and 112.68

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Solution

The fourth proportional to 161.89, 223.21 and 112.68 is: 155.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.89 : 223.21 = 112.68 : x
  2. Step 2: Convert to fraction form
    161.89/223.21 = 112.68/x
  3. Step 3: Cross multiply
    161.89x = 223.21 × 112.68
  4. Step 4: Simplify right side
    161.89x = 25,151.44
  5. Step 5: Solve for x
    x = 25,151.44/161.89
  6. Step 6: Final answer
    x = 155.36

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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.