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Finding the Fourth Proportional to 108.12, 161.25 and 104.18

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Solution

The fourth proportional to 108.12, 161.25 and 104.18 is: 155.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.12 : 161.25 = 104.18 : x
  2. Step 2: Convert to fraction form
    108.12/161.25 = 104.18/x
  3. Step 3: Cross multiply
    108.12x = 161.25 × 104.18
  4. Step 4: Simplify right side
    108.12x = 16,798.22
  5. Step 5: Solve for x
    x = 16,798.22/108.12
  6. Step 6: Final answer
    x = 155.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.