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Finding the Fourth Proportional to 6,218.90, 8,578.31 and 3,979.98

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Solution

The fourth proportional to 6,218.90, 8,578.31 and 3,979.98 is: 5,489.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,218.90 : 8,578.31 = 3,979.98 : x
  2. Step 2: Convert to fraction form
    6,218.90/8,578.31 = 3,979.98/x
  3. Step 3: Cross multiply
    6,218.90x = 8,578.31 × 3,979.98
  4. Step 4: Simplify right side
    6,218.90x = 34,141,482.33
  5. Step 5: Solve for x
    x = 34,141,482.33/6,218.90
  6. Step 6: Final answer
    x = 5,489.96

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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.