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Finding the Fourth Proportional to 5,731.75, 7,909.78 and 3,213.86

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Solution

The fourth proportional to 5,731.75, 7,909.78 and 3,213.86 is: 4,435.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,731.75 : 7,909.78 = 3,213.86 : x
  2. Step 2: Convert to fraction form
    5,731.75/7,909.78 = 3,213.86/x
  3. Step 3: Cross multiply
    5,731.75x = 7,909.78 × 3,213.86
  4. Step 4: Simplify right side
    5,731.75x = 25,420,890.02
  5. Step 5: Solve for x
    x = 25,420,890.02/5,731.75
  6. Step 6: Final answer
    x = 4,435.10

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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.