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Finding the Fourth Proportional to 908.05, 1,361.69 and 445.69

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Solution

The fourth proportional to 908.05, 1,361.69 and 445.69 is: 668.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.05 : 1,361.69 = 445.69 : x
  2. Step 2: Convert to fraction form
    908.05/1,361.69 = 445.69/x
  3. Step 3: Cross multiply
    908.05x = 1,361.69 × 445.69
  4. Step 4: Simplify right side
    908.05x = 606,891.62
  5. Step 5: Solve for x
    x = 606,891.62/908.05
  6. Step 6: Final answer
    x = 668.35

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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.