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Finding the Fourth Proportional to 112.20, 168 and 63.90

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Solution

The fourth proportional to 112.20, 168 and 63.90 is: 95.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.20 : 168 = 63.90 : x
  2. Step 2: Convert to fraction form
    112.20/168 = 63.90/x
  3. Step 3: Cross multiply
    112.20x = 168 × 63.90
  4. Step 4: Simplify right side
    112.20x = 10,735.20
  5. Step 5: Solve for x
    x = 10,735.20/112.20
  6. Step 6: Final answer
    x = 95.68

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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.