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Finding the Fourth Proportional to 8,401.60, 12,589.60 and 7,940.80

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Solution

The fourth proportional to 8,401.60, 12,589.60 and 7,940.80 is: 11,899.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,401.60 : 12,589.60 = 7,940.80 : x
  2. Step 2: Convert to fraction form
    8,401.60/12,589.60 = 7,940.80/x
  3. Step 3: Cross multiply
    8,401.60x = 12,589.60 × 7,940.80
  4. Step 4: Simplify right side
    8,401.60x = 99,971,495.68
  5. Step 5: Solve for x
    x = 99,971,495.68/8,401.60
  6. Step 6: Final answer
    x = 11,899.10

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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.