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Finding the Fourth Proportional to 3,431.46, 5,147.21 and 834.40

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Solution

The fourth proportional to 3,431.46, 5,147.21 and 834.40 is: 1,251.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,431.46 : 5,147.21 = 834.40 : x
  2. Step 2: Convert to fraction form
    3,431.46/5,147.21 = 834.40/x
  3. Step 3: Cross multiply
    3,431.46x = 5,147.21 × 834.40
  4. Step 4: Simplify right side
    3,431.46x = 4,294,814.98
  5. Step 5: Solve for x
    x = 4,294,814.98/3,431.46
  6. Step 6: Final answer
    x = 1,251.60

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1.5x scale

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.