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Finding the Fourth Proportional to 112.46, 168.42 and 99.64

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Solution

The fourth proportional to 112.46, 168.42 and 99.64 is: 149.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.46 : 168.42 = 99.64 : x
  2. Step 2: Convert to fraction form
    112.46/168.42 = 99.64/x
  3. Step 3: Cross multiply
    112.46x = 168.42 × 99.64
  4. Step 4: Simplify right side
    112.46x = 16,780.95
  5. Step 5: Solve for x
    x = 16,780.95/112.46
  6. Step 6: Final answer
    x = 149.21

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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.