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Finding the Fourth Proportional to 694.29, 1,040.74 and 328.43

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Solution

The fourth proportional to 694.29, 1,040.74 and 328.43 is: 492.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.29 : 1,040.74 = 328.43 : x
  2. Step 2: Convert to fraction form
    694.29/1,040.74 = 328.43/x
  3. Step 3: Cross multiply
    694.29x = 1,040.74 × 328.43
  4. Step 4: Simplify right side
    694.29x = 341,804.21
  5. Step 5: Solve for x
    x = 341,804.21/694.29
  6. Step 6: Final answer
    x = 492.31

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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.