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Finding the Fourth Proportional to 112.03, 168.13 and 83.21

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Solution

The fourth proportional to 112.03, 168.13 and 83.21 is: 124.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.03 : 168.13 = 83.21 : x
  2. Step 2: Convert to fraction form
    112.03/168.13 = 83.21/x
  3. Step 3: Cross multiply
    112.03x = 168.13 × 83.21
  4. Step 4: Simplify right side
    112.03x = 13,988.89
  5. Step 5: Solve for x
    x = 13,988.89/112.03
  6. Step 6: Final answer
    x = 124.87

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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.