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Finding the Fourth Proportional to 2,640.72, 3,960.92 and 692.88

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Solution

The fourth proportional to 2,640.72, 3,960.92 and 692.88 is: 1,039.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.72 : 3,960.92 = 692.88 : x
  2. Step 2: Convert to fraction form
    2,640.72/3,960.92 = 692.88/x
  3. Step 3: Cross multiply
    2,640.72x = 3,960.92 × 692.88
  4. Step 4: Simplify right side
    2,640.72x = 2,744,442.25
  5. Step 5: Solve for x
    x = 2,744,442.25/2,640.72
  6. Step 6: Final answer
    x = 1,039.28

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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.