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Finding the Fourth Proportional to 198.37, 273 and 156.79

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Solution

The fourth proportional to 198.37, 273 and 156.79 is: 215.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.37 : 273 = 156.79 : x
  2. Step 2: Convert to fraction form
    198.37/273 = 156.79/x
  3. Step 3: Cross multiply
    198.37x = 273 × 156.79
  4. Step 4: Simplify right side
    198.37x = 42,803.67
  5. Step 5: Solve for x
    x = 42,803.67/198.37
  6. Step 6: Final answer
    x = 215.78

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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.