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Finding the Fourth Proportional to 409.11, 613.73 and 135.13

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Solution

The fourth proportional to 409.11, 613.73 and 135.13 is: 202.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.11 : 613.73 = 135.13 : x
  2. Step 2: Convert to fraction form
    409.11/613.73 = 135.13/x
  3. Step 3: Cross multiply
    409.11x = 613.73 × 135.13
  4. Step 4: Simplify right side
    409.11x = 82,933.39
  5. Step 5: Solve for x
    x = 82,933.39/409.11
  6. Step 6: Final answer
    x = 202.71

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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.