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Finding the Fourth Proportional to 8,279.90, 12,405.45 and 6,811.10

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Solution

The fourth proportional to 8,279.90, 12,405.45 and 6,811.10 is: 10,204.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,279.90 : 12,405.45 = 6,811.10 : x
  2. Step 2: Convert to fraction form
    8,279.90/12,405.45 = 6,811.10/x
  3. Step 3: Cross multiply
    8,279.90x = 12,405.45 × 6,811.10
  4. Step 4: Simplify right side
    8,279.90x = 84,494,760.50
  5. Step 5: Solve for x
    x = 84,494,760.50/8,279.90
  6. Step 6: Final answer
    x = 10,204.80

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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.