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Finding the Fourth Proportional to 161.26, 241.72 and 69.86

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Solution

The fourth proportional to 161.26, 241.72 and 69.86 is: 104.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.26 : 241.72 = 69.86 : x
  2. Step 2: Convert to fraction form
    161.26/241.72 = 69.86/x
  3. Step 3: Cross multiply
    161.26x = 241.72 × 69.86
  4. Step 4: Simplify right side
    161.26x = 16,886.99
  5. Step 5: Solve for x
    x = 16,886.99/161.26
  6. Step 6: Final answer
    x = 104.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.