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Finding the Fourth Proportional to 161.52, 222.91 and 91.60

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Solution

The fourth proportional to 161.52, 222.91 and 91.60 is: 126.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.52 : 222.91 = 91.60 : x
  2. Step 2: Convert to fraction form
    161.52/222.91 = 91.60/x
  3. Step 3: Cross multiply
    161.52x = 222.91 × 91.60
  4. Step 4: Simplify right side
    161.52x = 20,418.56
  5. Step 5: Solve for x
    x = 20,418.56/161.52
  6. Step 6: Final answer
    x = 126.42

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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.