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Finding the Fourth Proportional to 8,412.61, 12,620.40 and 3,479.49

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Solution

The fourth proportional to 8,412.61, 12,620.40 and 3,479.49 is: 5,219.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,412.61 : 12,620.40 = 3,479.49 : x
  2. Step 2: Convert to fraction form
    8,412.61/12,620.40 = 3,479.49/x
  3. Step 3: Cross multiply
    8,412.61x = 12,620.40 × 3,479.49
  4. Step 4: Simplify right side
    8,412.61x = 43,912,475.10
  5. Step 5: Solve for x
    x = 43,912,475.10/8,412.61
  6. Step 6: Final answer
    x = 5,219.84

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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.