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Finding the Fourth Proportional to 8,412.99, 12,620.96 and 3,479.86

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Solution

The fourth proportional to 8,412.99, 12,620.96 and 3,479.86 is: 5,220.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,412.99 : 12,620.96 = 3,479.86 : x
  2. Step 2: Convert to fraction form
    8,412.99/12,620.96 = 3,479.86/x
  3. Step 3: Cross multiply
    8,412.99x = 12,620.96 × 3,479.86
  4. Step 4: Simplify right side
    8,412.99x = 43,919,173.87
  5. Step 5: Solve for x
    x = 43,919,173.87/8,412.99
  6. Step 6: Final answer
    x = 5,220.40

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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.