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Finding the Fourth Proportional to 198.50, 273.29 and 172.61

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Solution

The fourth proportional to 198.50, 273.29 and 172.61 is: 237.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.50 : 273.29 = 172.61 : x
  2. Step 2: Convert to fraction form
    198.50/273.29 = 172.61/x
  3. Step 3: Cross multiply
    198.50x = 273.29 × 172.61
  4. Step 4: Simplify right side
    198.50x = 47,172.41
  5. Step 5: Solve for x
    x = 47,172.41/198.50
  6. Step 6: Final answer
    x = 237.64

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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.