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Finding the Fourth Proportional to 108.30, 161.88 and 84

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Solution

The fourth proportional to 108.30, 161.88 and 84 is: 125.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.30 : 161.88 = 84 : x
  2. Step 2: Convert to fraction form
    108.30/161.88 = 84/x
  3. Step 3: Cross multiply
    108.30x = 161.88 × 84
  4. Step 4: Simplify right side
    108.30x = 13,597.92
  5. Step 5: Solve for x
    x = 13,597.92/108.30
  6. Step 6: Final answer
    x = 125.56

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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.