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Finding the Fourth Proportional to 3,147.11, 4,720.63 and 838.61

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Solution

The fourth proportional to 3,147.11, 4,720.63 and 838.61 is: 1,257.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,147.11 : 4,720.63 = 838.61 : x
  2. Step 2: Convert to fraction form
    3,147.11/4,720.63 = 838.61/x
  3. Step 3: Cross multiply
    3,147.11x = 4,720.63 × 838.61
  4. Step 4: Simplify right side
    3,147.11x = 3,958,767.52
  5. Step 5: Solve for x
    x = 3,958,767.52/3,147.11
  6. Step 6: Final answer
    x = 1,257.91

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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.