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Finding the Fourth Proportional to 108.21, 162.43 and 89.15

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Solution

The fourth proportional to 108.21, 162.43 and 89.15 is: 133.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.21 : 162.43 = 89.15 : x
  2. Step 2: Convert to fraction form
    108.21/162.43 = 89.15/x
  3. Step 3: Cross multiply
    108.21x = 162.43 × 89.15
  4. Step 4: Simplify right side
    108.21x = 14,481.26
  5. Step 5: Solve for x
    x = 14,481.26/108.21
  6. Step 6: Final answer
    x = 133.82

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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.