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Finding the Fourth Proportional to 694.38, 1,039.49 and 419.64

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Solution

The fourth proportional to 694.38, 1,039.49 and 419.64 is: 628.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.38 : 1,039.49 = 419.64 : x
  2. Step 2: Convert to fraction form
    694.38/1,039.49 = 419.64/x
  3. Step 3: Cross multiply
    694.38x = 1,039.49 × 419.64
  4. Step 4: Simplify right side
    694.38x = 436,207.16
  5. Step 5: Solve for x
    x = 436,207.16/694.38
  6. Step 6: Final answer
    x = 628.20

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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.