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Finding the Fourth Proportional to 674.29, 1,004.31 and 644.31

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Solution

The fourth proportional to 674.29, 1,004.31 and 644.31 is: 959.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.29 : 1,004.31 = 644.31 : x
  2. Step 2: Convert to fraction form
    674.29/1,004.31 = 644.31/x
  3. Step 3: Cross multiply
    674.29x = 1,004.31 × 644.31
  4. Step 4: Simplify right side
    674.29x = 647,086.98
  5. Step 5: Solve for x
    x = 647,086.98/674.29
  6. Step 6: Final answer
    x = 959.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.