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Finding the Fourth Proportional to 692.43, 1,031.96 and 669.03

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Solution

The fourth proportional to 692.43, 1,031.96 and 669.03 is: 997.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.43 : 1,031.96 = 669.03 : x
  2. Step 2: Convert to fraction form
    692.43/1,031.96 = 669.03/x
  3. Step 3: Cross multiply
    692.43x = 1,031.96 × 669.03
  4. Step 4: Simplify right side
    692.43x = 690,408.85
  5. Step 5: Solve for x
    x = 690,408.85/692.43
  6. Step 6: Final answer
    x = 997.08

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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.