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Finding the Fourth Proportional to 6,387.76, 8,815.31 and 3,996.97

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Solution

The fourth proportional to 6,387.76, 8,815.31 and 3,996.97 is: 5,515.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,387.76 : 8,815.31 = 3,996.97 : x
  2. Step 2: Convert to fraction form
    6,387.76/8,815.31 = 3,996.97/x
  3. Step 3: Cross multiply
    6,387.76x = 8,815.31 × 3,996.97
  4. Step 4: Simplify right side
    6,387.76x = 35,234,502.58
  5. Step 5: Solve for x
    x = 35,234,502.58/6,387.76
  6. Step 6: Final answer
    x = 5,515.94

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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.