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Finding the Fourth Proportional to 161.26, 222.55 and 91.30

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Solution

The fourth proportional to 161.26, 222.55 and 91.30 is: 125.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.26 : 222.55 = 91.30 : x
  2. Step 2: Convert to fraction form
    161.26/222.55 = 91.30/x
  3. Step 3: Cross multiply
    161.26x = 222.55 × 91.30
  4. Step 4: Simplify right side
    161.26x = 20,317.82
  5. Step 5: Solve for x
    x = 20,317.82/161.26
  6. Step 6: Final answer
    x = 125.99

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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.