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Finding the Fourth Proportional to 908.09, 1,361.90 and 439.10

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Solution

The fourth proportional to 908.09, 1,361.90 and 439.10 is: 658.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.09 : 1,361.90 = 439.10 : x
  2. Step 2: Convert to fraction form
    908.09/1,361.90 = 439.10/x
  3. Step 3: Cross multiply
    908.09x = 1,361.90 × 439.10
  4. Step 4: Simplify right side
    908.09x = 598,010.29
  5. Step 5: Solve for x
    x = 598,010.29/908.09
  6. Step 6: Final answer
    x = 658.54

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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.