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Finding the Fourth Proportional to 404.05, 605.90 and 115.42

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Solution

The fourth proportional to 404.05, 605.90 and 115.42 is: 173.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.05 : 605.90 = 115.42 : x
  2. Step 2: Convert to fraction form
    404.05/605.90 = 115.42/x
  3. Step 3: Cross multiply
    404.05x = 605.90 × 115.42
  4. Step 4: Simplify right side
    404.05x = 69,932.40
  5. Step 5: Solve for x
    x = 69,932.40/404.05
  6. Step 6: Final answer
    x = 173.08

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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.