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Finding the Fourth Proportional to 108.21, 161.82 and 79.14

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Solution

The fourth proportional to 108.21, 161.82 and 79.14 is: 118.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.21 : 161.82 = 79.14 : x
  2. Step 2: Convert to fraction form
    108.21/161.82 = 79.14/x
  3. Step 3: Cross multiply
    108.21x = 161.82 × 79.14
  4. Step 4: Simplify right side
    108.21x = 12,806.43
  5. Step 5: Solve for x
    x = 12,806.43/108.21
  6. Step 6: Final answer
    x = 118.35

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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.