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Finding the Fourth Proportional to 198.72, 273.90 and 157.08

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Solution

The fourth proportional to 198.72, 273.90 and 157.08 is: 216.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.72 : 273.90 = 157.08 : x
  2. Step 2: Convert to fraction form
    198.72/273.90 = 157.08/x
  3. Step 3: Cross multiply
    198.72x = 273.90 × 157.08
  4. Step 4: Simplify right side
    198.72x = 43,024.21
  5. Step 5: Solve for x
    x = 43,024.21/198.72
  6. Step 6: Final answer
    x = 216.51

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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.