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Finding the Fourth Proportional to 197.87, 273.09 and 145.39

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Solution

The fourth proportional to 197.87, 273.09 and 145.39 is: 200.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.87 : 273.09 = 145.39 : x
  2. Step 2: Convert to fraction form
    197.87/273.09 = 145.39/x
  3. Step 3: Cross multiply
    197.87x = 273.09 × 145.39
  4. Step 4: Simplify right side
    197.87x = 39,703.83
  5. Step 5: Solve for x
    x = 39,703.83/197.87
  6. Step 6: Final answer
    x = 200.66

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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.