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Finding the Fourth Proportional to 112.20, 167.80 and 100.09

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Solution

The fourth proportional to 112.20, 167.80 and 100.09 is: 149.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.20 : 167.80 = 100.09 : x
  2. Step 2: Convert to fraction form
    112.20/167.80 = 100.09/x
  3. Step 3: Cross multiply
    112.20x = 167.80 × 100.09
  4. Step 4: Simplify right side
    112.20x = 16,795.10
  5. Step 5: Solve for x
    x = 16,795.10/112.20
  6. Step 6: Final answer
    x = 149.69

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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.