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Finding the Fourth Proportional to 694.29, 1,040.85 and 329.25

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Solution

The fourth proportional to 694.29, 1,040.85 and 329.25 is: 493.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.29 : 1,040.85 = 329.25 : x
  2. Step 2: Convert to fraction form
    694.29/1,040.85 = 329.25/x
  3. Step 3: Cross multiply
    694.29x = 1,040.85 × 329.25
  4. Step 4: Simplify right side
    694.29x = 342,699.86
  5. Step 5: Solve for x
    x = 342,699.86/694.29
  6. Step 6: Final answer
    x = 493.60

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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.