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Finding the Fourth Proportional to 161.39, 221.49 and 143.49

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Solution

The fourth proportional to 161.39, 221.49 and 143.49 is: 196.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.39 : 221.49 = 143.49 : x
  2. Step 2: Convert to fraction form
    161.39/221.49 = 143.49/x
  3. Step 3: Cross multiply
    161.39x = 221.49 × 143.49
  4. Step 4: Simplify right side
    161.39x = 31,781.60
  5. Step 5: Solve for x
    x = 31,781.60/161.39
  6. Step 6: Final answer
    x = 196.93

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.