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Finding the Fourth Proportional to 3,899.52, 5,379.32 and 2,640.64

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Solution

The fourth proportional to 3,899.52, 5,379.32 and 2,640.64 is: 3,642.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.52 : 5,379.32 = 2,640.64 : x
  2. Step 2: Convert to fraction form
    3,899.52/5,379.32 = 2,640.64/x
  3. Step 3: Cross multiply
    3,899.52x = 5,379.32 × 2,640.64
  4. Step 4: Simplify right side
    3,899.52x = 14,204,847.56
  5. Step 5: Solve for x
    x = 14,204,847.56/3,899.52
  6. Step 6: Final answer
    x = 3,642.72

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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.