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Finding the Fourth Proportional to 273.45, 409.82 and 129.21

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Solution

The fourth proportional to 273.45, 409.82 and 129.21 is: 193.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.45 : 409.82 = 129.21 : x
  2. Step 2: Convert to fraction form
    273.45/409.82 = 129.21/x
  3. Step 3: Cross multiply
    273.45x = 409.82 × 129.21
  4. Step 4: Simplify right side
    273.45x = 52,952.20
  5. Step 5: Solve for x
    x = 52,952.20/273.45
  6. Step 6: Final answer
    x = 193.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.