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Finding the Fourth Proportional to 198.45, 273.98 and 124.74

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Solution

The fourth proportional to 198.45, 273.98 and 124.74 is: 172.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.45 : 273.98 = 124.74 : x
  2. Step 2: Convert to fraction form
    198.45/273.98 = 124.74/x
  3. Step 3: Cross multiply
    198.45x = 273.98 × 124.74
  4. Step 4: Simplify right side
    198.45x = 34,176.58
  5. Step 5: Solve for x
    x = 34,176.58/198.45
  6. Step 6: Final answer
    x = 172.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.