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Finding the Fourth Proportional to 8,990.22, 12,400.38 and 8,246.64

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Solution

The fourth proportional to 8,990.22, 12,400.38 and 8,246.64 is: 11,374.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.22 : 12,400.38 = 8,246.64 : x
  2. Step 2: Convert to fraction form
    8,990.22/12,400.38 = 8,246.64/x
  3. Step 3: Cross multiply
    8,990.22x = 12,400.38 × 8,246.64
  4. Step 4: Simplify right side
    8,990.22x = 102,261,469.72
  5. Step 5: Solve for x
    x = 102,261,469.72/8,990.22
  6. Step 6: Final answer
    x = 11,374.75

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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.