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Finding the Fourth Proportional to 8,069.76, 12,081.92 and 6,428.80

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Solution

The fourth proportional to 8,069.76, 12,081.92 and 6,428.80 is: 9,625.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,069.76 : 12,081.92 = 6,428.80 : x
  2. Step 2: Convert to fraction form
    8,069.76/12,081.92 = 6,428.80/x
  3. Step 3: Cross multiply
    8,069.76x = 12,081.92 × 6,428.80
  4. Step 4: Simplify right side
    8,069.76x = 77,672,247.30
  5. Step 5: Solve for x
    x = 77,672,247.30/8,069.76
  6. Step 6: Final answer
    x = 9,625.10

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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.