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Finding the Fourth Proportional to 108.32, 163.16 and 80

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Solution

The fourth proportional to 108.32, 163.16 and 80 is: 120.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.32 : 163.16 = 80 : x
  2. Step 2: Convert to fraction form
    108.32/163.16 = 80/x
  3. Step 3: Cross multiply
    108.32x = 163.16 × 80
  4. Step 4: Simplify right side
    108.32x = 13,052.80
  5. Step 5: Solve for x
    x = 13,052.80/108.32
  6. Step 6: Final answer
    x = 120.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.