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Finding the Fourth Proportional to 6,640.33, 9,163.68 and 3,987.78

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Solution

The fourth proportional to 6,640.33, 9,163.68 and 3,987.78 is: 5,503.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.33 : 9,163.68 = 3,987.78 : x
  2. Step 2: Convert to fraction form
    6,640.33/9,163.68 = 3,987.78/x
  3. Step 3: Cross multiply
    6,640.33x = 9,163.68 × 3,987.78
  4. Step 4: Simplify right side
    6,640.33x = 36,542,764.49
  5. Step 5: Solve for x
    x = 36,542,764.49/6,640.33
  6. Step 6: Final answer
    x = 5,503.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.